NC0004961_RBSS CSA Report_Figures_20150818

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DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
AUGUST 2015
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2-1

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NOTES:
I. SOURCE: USGS TOPOGRAPHIC MAP - PAW CREEK,
CREATED1948.
SCALE (FEET)
500 0 500 1000
1
1948 PAW CREEK TOPO
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
2-3

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ELECTRICAL STORAGE
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Figure 2-6. RIVERBEND STEAM STATION FLOW SCHEMATIC
Groundwater
Remediation
Track Hopper Sump
MAY 14, 2014
oil Water Separator
L Groundwater
0.03
0.05
MGD
MGD
001
5tormwater from MGD
Roof Drains &
Paving
0.023
Stormwater from Coal
MGD
Pile
Yard
Drain Sump
0.001 0.001
0.001
MGD General Plant MGD
Drinking Water System
MGD
City of Mt.Holly Supply Sanitary --T-�a1M Sanitary System
i
Wastewater
i
0.025
Evaporation &
0.139
1.0
MGD
MGD
T Infiltration
MGD =
0.021
i
MGD
i Stormwater from Pond Areas &
Turbine Room Sump
I Upgradlent Watershed— I
Ash Basin
0.025
0.025
MGD
MGD
I Boiler Room Sump
SeepageSurface
Intermittent
0.195
Intermittent
0.025 MGD
MGD
0.139 =
Old End Pit Sump
MGD ;
0.025 MGD
Outfall002
Outfall 002A
y 0.15 <0.1
<0.1
Outfall 001
MGD I MGD
MGD
Catawba River -- 1 Intake Tunnel Plant Chiller System
Mountain Island Lake
Flows are approximated averages which have a high variability on a daily basis

Figure 2-7. Riverbend Steam Station Flow Schematic March 25, 2014
INTAKE TUNNEL FROM CATAWBA RIVER
INDUCED DRAFT FAN COOLING
0.15 MCD
335 MCD
WATER
I TAKESCRE}N BACKWASH
IN
PREHEOLTER HEARING
0.15 MCD
COO UNG WATER
INDUCEDFAN & PREHFATER
BEARING COOLING WATER
DRINKING WATER SYSTEM
(Mount Holly Drinking Weir
Supply)
I PLANT C HH.LER SYSTEM I
TURB WE LURE O D. COOLERS
CONDENSATECOOLERS
EXHAUSTSTFAM CONDENSERS
11MI ETUNNELUNWATERINC
SUMP
FD.TERED WATER AND ASH
REMOVAL SYSTEM
FILTERED WATER SYSTEM
GENERALPLANTT RARER
SANITARY WASTEWATER
I LABORATORY DRAINS I
CHEMICAL MAKEUP TANKS
AND DRUMS RINSATE
DHWWERALIZER SYSTEM
GRAVITY FILTERBACKWASH 0.004 MGD
AND CLARIFIER SLUDGE
Ir
STORM WATER FROM ROOF
DRAWS AND PAVING I W
STORM WATER FROM COAL 0.023 MCD
PDE
SANITARY SYSTEM
0.01 MCD
K
1
W
07
DI
3
A
0.03MCD
GROUNDWATERREMEDATION
OUIWATER SEPARATOR
0
W
cm,
W
/
0.1 MC TRACKHOPPER
3
SUMP
V
(GROUNDWATER)
O
Z
Cr
1 ASH REMOVAL SYSTEM fD
7
3 MCD O.
M
1.4 MGD DI
YARD DRAIN SUMP 3
1 MGD !
TURB WEROO M SUMPS
BOILER ROOM SUMPS A
SN BASIN
13 MCD
✓STORM WATER FROM POND EVAPORA'DON
AREAS AND UPGRADO.NT 0.31 MCD AND SEEPAGE
WATERSHED 1 MGD
DID END PLTSUMP
002 (5 MGD)
001
MourruIN SLAM LAKE361.5 MGD)
H
O
7

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o
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Volcanic Ash Shale Fly Ash Bottom Ash
■Si ■AI Fe Ca ■Other Major Elements ■Minor Elements ■Trace Elements
NOTES:
1. FIGURE WAS OBTAINED FROM THE EPRI COMPARISON OF COAL COMBUSTION PRODUCTS TO OTHER
MATERIALS - CHEMICAL CHARACTERISTICS, FIGURE 3-1, PG 3-2, EPRI, FINAL REPORT, SEPTEMBER 2010.
ELEMENTAL COMPOSITION FOR BOTTOM ASH,
FLY ASH, SHALE, AND VOLCANIC ASH
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
3-2
GASTON COUNTY, NORTH CAROLINA

1000
'I 00
J_
� 10
C
p t
,`� 0 . i
W
0.01
0
0.001
0.0001
,
0.00001
As Ba Cd Cr Pb Hg se Ag
Oklinirnum
"Mum
90L*'Pem-eral-e Element
TCL P ReWl atcry Limi t
1[Ni' P�roerltil�
NOTES:
1. FIGURE WAS OBTAINED FROM THE EPRI COMPARISON OF COAL COMBUSTION PRODUCTS TO OTHER
MATERIALS — CHEMICAL CHARACTERISTICS, FIGURE 9-1, PG 9-1, EPRI, FINAL REPORT, SEPTEMBER 2010.
COAL ASH TCLP LEACHATE CONCENTRATION
VS REGULATORY LIMITS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
3-3
ASTON COUNTY, NORTH CAROLINA

100000
10000
i • �
cm 1000 •
100 • • I I
0 • i
10 �
L
� 1
0.1
0.01
0.001
As Ba Cd Cr Pb Hg 5e Ag Sb Be B Co Cu Mn Ni TC 'V Zn
EPA Residential Soil Screening Level Element
"Concentrations less than
Fly Ash Range (10m and 901 percentile) method detection limits.
NOTES:
1. EPRI 2009B.
TRACE ELEMENTS IN FLY ASH VS SOIL (EPRI)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
3-4

100000
10000
• • •
Y
1000 •
E 100 • I
410
•
L I
� 1
c
0 0.1
0.01
0.001- t
As Ba Cd Cr Pb Hg Se Ag Sb Be B Cu Mn Ni TI V Zn
EPA Residential Soil Screening Level Element
`Concentrations less than
Bottom Ash Range (101 and 901 percentile) method detection limits.
NOTES:
1. EPRI 2009B.
TRACE ELEMENTS IN BOTTOM ASH VS SOIL (EPRI)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
3-5

cove `1 0
Ck
IL
IS
I y J
1 J
CON
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r
SIN' �1 �� ;� \ �=• -- l
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( • ;�; • J
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x "
� .Sts :'' FrO VF Legend
_ s r ' y r• r w�� ��, — — ® DUKE ENERGY PROPERTY BOUNDARY
ol
INE / ASH BASIN WASTE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
11
O•,($ . _ J;. � `•-,�; T '�/) ` • ASH BASIN COMPLIANCE BOUNDARY
• COINCIDENT WITH DUKE ENERGY
OX �, • PROPERTY BOUNDARY
`^ / � ' '�y1 ` ` ' 0.5 MILE OFFSET FROM ASH BASIN
t �, COMPLIANCE BOUNDARY
r �•i �l \ o� •�,ti • • STREAM
'f o'�� ` �' ■ SURFACE WATER INTAKE
a�i •�� L •� o' _+_ ` ID
..' r� REPORTED PRIVATE WATER SUPPLY WELL
NOTES: ` SCALE (FEET) DATE
1.ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE.
USGS RECEPTOR MAP
2. PRIVATE WELLS LOCATIONS ARE APPROXIMATE. 500 0 500 1,000 DUKE ENERGY CAROLINAS, LLC AUGUST2015
3. USGS 7.5-MINUTE SERIES TOTOGRAPHIC BASEMAP COPYRIGHT:© 2013 NATIONAL GEOGRAPHIC SOCIETY, I -CUBED
4 THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a). RIVERBEND STEAM STATION ASH BASIN
5. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS LAKE NORMAN SOUTH, NC AND MOUNTAIN ISLAND LAKE, NC -VA. FIGURE
6. DUKE ENERGY PROPERTY BOUNDARY WAS SUPPLIED BY DUKE ENERGY REAL ESTATE.
7 INFORMATION PERTAINING TO IDENTIFIED WATER SUPPLY WELLS IS INCLUDED IN TABLE 4-1 GASTON COUNTY, NORTH CAROLINA 4-1

NOTES:
1. ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE. SCALE(FEET)
2. PRIVATE WELLS LOCATIONS ARE APPROXIMATE.
3.ORTHOPHOTOGRAPHY IS FROM NC ONEMAP GIS ONLINE SERVICE. 500 0 500 1,000
4. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a).
5. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS LAKE NORMAN SOUTH, NC AND MOUNTAIN ISLAND LAKE, NC -VA.
6. DUKE ENERGY PROPERTY BOUNDARY WAS SUPPLIED BY DUKE ENERGY REAL ESTATE.
7. PROPERTY BOUNDARIES WERE SUPPLIED BYTHE GASTON COUNTYAND MECKLENBURG COUNTY GIS OFFICES.
8. INFORMATION PERTAINING TO IDENTIFIED WATER SUPPLY WELLS IS INCLUDED IN TABLE 4-1
F)l
RECEPTOR MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
4-2

NOTES:
1. ASH BASIN, ASH STORAGE AREA, AND CINDER STORAGE AREA WASTE BOUNDARIES ARE APPROXIMATE.
2. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
3. CMP IS ASSUMED TO BE AN ABBREVIATION FOR CORRUGATED METAL PIPE. HDPE IS ASSUMED TO BE AN
ABBREVIATION FOR HIGH DENSITY POLYETHYLENE. CPP IS ASSUMED TO BE AN ABBREVIATION FOR CORRUGATED
PLASTIC PIPE. RCP IS ASSUMED TO BE AN ABBREVIATION FOR REINFORCED CONCRETE PIPE.
4. UNDERGROUND FEATURES PROVIDED BY STANTEC AND DUKE ENERGY.
S. PIPE LOCATION AND LENGTH SHOWN ARE APPROXIMATE.
SCALE (FEET)
/00' 0 /00' 200'
/" = 200'
LEGEND:
N
ASH BASIN WASTE BOUNDARY
1500 FT OFFSET FROM ASH BASIN WASTE BOUNDARY
PIPE SEGMENT
ASH BASIN UNDERGROUND FEATURES MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
GASTON COUNTY, NORTH CAROLINA
4-3

NOTES:
1. ASH BASIN, ASH STORAGE AREA, AND CINDER STORAGE AREA WASTE BOUNDARIES ARE APPROXIMATE.
2. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
3. CMP IS ASSUMED TO BE AN ABBREVIATION FOR CORRUGATED METAL PIPE. HDPE IS ASSUMED TO BE AN
ABBREVIATION FOR HIGH DENSITY POLYETHYLENE. CPP IS ASSUMED TO BE AN ABBREVIATION FOR CORRUGATED
PLASTIC PIPE. RCP IS ASSUMED TO BE AN ABBREVIATION FOR REINFORCED CONCRETE PIPE.
4. UNDERGROUND FEATURES PROVIDED BY STANTEC AND DUKE ENERGY.
S. PIPE LOCATION AND LENGTH SHOWN ARE APPROXIMATE.
•IV
.3 -.t
.14
1Z*
.' 'L•S.>t' Y,i✓ i4' to ,�" (4
ip
7 -� i i !, ( j,,,•;tiYt �: ` ♦ t ,� ram- } . (' � „ �s
�
SCALE (FEET)
/00' 0 /00' 200'
l" = 200'
LEGEND:
ASH BASIN WASTE BOUNDARY
F ;t*-T_T-1017!_'il41911P►fITITA7
PIPE SEGMENT
ASH STORAGE AND CINDER STORAGE
UNDERGROUND FEATURES MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST
FIGURE
N
2015
GASTON COUNTY, NORTH CAROLINA

NOTES:
1. ASH BASIN, ASH STORAGE AREA, AND CINDER STORAGE AREAWASTE BOUNDARIES AREAPPROXIMATE.
2.ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP(DATEDAPRIL2014).
3. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS MOUNTAIN ISLAND LAKE, NCAND ON -SITE OBSERVATIONS.
SCALE (FEET)
200' 0 200' 4 00'
P = 400'
SURFACE WATER BODIES
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
I
LEGEND:
ASH BASIN WASTE BOUNDARY
1500 FT OFFSET FROM ASH BASIN WASTE BOUNDARY
STREAM
DATE
AUGUST 2015
FIGURE
GASTO N COUNTY, NORTH CAROLINA
4-5

SCALE (FEET)
500 0 500 1,000
NOTES:
1. ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE.
2. PROPERTY BOUNDARIES WERE SUPPLIED BY THE GASTON COUNTY AND MECKLENBURG COUNTY GIS OFFICES.
3.ORTHOPHOTOGRAPHY IS FROM NC ONEMAP GIS ONLINE SERVICE.
4. INFORMATION PERTAINING TO IDENTIFIED PROPERTIES IS INCLUDED IN TABLE 4-2
F)l
PROPERTIES CONTIGUOUS TO
THE ASH BASIN WASTE BOUNDARY
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
4-6

Tectonic Map Explanation
(NOTE: Subsurface continuation of terranes shown in lightershade of same color)
Triassic -Jurassic basins
(patterned subsurface;
rifting of Pangaea)
Igneous Rocks
190-170 Me dikes sills, & flows
(Rifting of Pangaea)
285-265 Ma granitoid plutons
(Modern age dates)
325-285 Ma granhold plutons
(Modern age dates)
350-325 Ma granitoidplutons
(Modern age dates)
380-355 Ma granitoid plutons
(Modern age dates)
410-80 Ma plutons
Likely Ordovician plutons
(no age dates)
_Ordovician
plutons
(Modem age dates)
Greenstone and amphibolite
(Neoproterozoic to Ordovician)
of arc, WORB, and continental
affinities. Only Blue Ridge units
shown; includes Catoctin Frn. (VA) x
Hillabee Greenstone (AL -GA).
_Ultramafic
rocks
(Neoproterozolc to Ordovician)
_700-530
Ms arc -related granitoids
(Carolina superterrane)
-735 Ma rift -related a!kafc plutons
(Failed rifting of Rodinia)
Laurentian Platform
$ Rifted Margin
Clastic Wedges
Allegha�tian (Mississippian -Pe)
Acadian and Neoacadian
(Late Dev.-early Mississippian)
Jemison Cheri (AL)
(Early to Middle Devonian)
Talladega beat (AL -GA)
Fossilifereous Erin Slate
(early Mississippian)
Lay Darn Formation
(MiddieOrdovician?
to D9vonian?)
Lower Cambrian to Lower Ordovician
Laurentian margin clastic and
carbonate rocks
Rifted margin succession
equivalents (Neoproterozoic-
Early Cambrian)
0 Wedowee Group(?) (AL)
(Ordovician or younger)
Taconian
Martinsburg -Tuscarora
(Caradoc to L/9ndovery)
glountian-Sevier-Rockmart
Mineral Sluff (Murphy syncline in Biue Ridge)
f L /an virn-Llandeilo)
Vecpraterozoic to Ordovician(?) rocks
of the Murphysyncline (includes Nantahala
and Brasstown Formations)
Platform Rocks
Cambrian -Ordovician
clastic to carbonate
Rifted ['Margin Rocks
Necproterozoic-Early Cambrian
ciastic & volcanic rocks, Includes
Sattimore terrane.
Quartzite of unknown amity in windows
in Cartoogechaye terrane, Tugaloo terrane,
and Sauratown Mountains window
Pine Mountain Window Rocks
Metamorphosed Paleozoic platform(?) cover
_ 1.0-1.1GAbasementrocks
Basement Rocks jBlue Ridge and western
Piedmont all Gondwanan affinity based on
Pb isra'opes)
-1.0-1,2Ga with oider inheritance.
Charriockile indicated by darker red.
- 1.8 Ga Wars Hill terrane
Terranes Accreted
During Taconian Events
(Laurentian affinity, distal, deep -water deposits)
Hamburg complex (Hc)
Allochthons and o istostromes of deep -water, distal margin
elastics and carbonates (Dauphin Formation) thrust into the
foreland over the Myerstown euxinic platform I;mestone, and
covered by the Martinsburg Formation. includes greenschist
facies equivalent clastic Cocalico Formation to the SE
Westminster terrane
NeoprotemroiclCambrian-Middle Ordovician deposition d
volcanism. Sedimentary component >>> volcanic.
Dahlonega gdd belt
Neoproteroroi Cambrian -Middle Ordovician clastic
deposition R MORB/arc voicaniSMr minor 1.15 Ga (?)
basement. Sedimentary component »> volcanic. Contains
detrital zircons of passible Gondwanan or Penokean affinity,
Cowrock terrane
Neoproleroroic/Cambrian clastic deposition, ophiolite, d
volcanism, minor 1.15Ga(?) basement. Sedimentary component
>>> volcanic. Middle Ordovician ton91ite plutor.
Cartoogechaye terrane
Neoproteroroicl ambrian(?) clastic deposition, ophiolite (maFic-
ultrama9c complexes), 8 ORS/tare volcanism. minor 1.15 Ga
basement. Sedimentary component>volcanic.
Terranes Accreted During
Neoacadian to Alleghanian Events
(distal, deep -water deposits
and arc-to-MORB zolcanics)
Cat Square terrane
Mixed L aurentian & Ava�onian affinity,
post-430 Ma deposition, minor arc-to-14ORB volcanics.
Tupaloo (-Milton-Potomac-Philadelphia) terrane
Dis al Laurentian; Neoproterozolc/Cambrian-Middle Ordovician
deposition & volcanism, minor 1.15 Ge basement;
arc -to -MORE volcanics; melanges. Abundant Ordovician
plutons. Sedimentary component» volcanic.
Smith River allochthon
Neoproterozoic metased/mentary and rnetavolcanic
rocks; Ordovician plutons. May have Laurentian and
Peri-Gondwanan provenance.
Kings Mountain (KMJ terrane
Mixed Laurentian A Avaion►on amity,
Neoproterozoic to Cambrian(?) deposition with Laurentian
affinity; arc volcanic rocks of peri-Gondwanan affinity.
Carolina superterrane (pe6-Gondwanan)
Carolina terrane
Supracrustal (low grades components
Neoproterozoic deposition and arc volcanism
to Ordovician (?) deposition.
®Charlotte terrane
infracrustal (high grade) components
Neoproterozolc deposition and arc volcanism.
Brunswick (Charleston) terrane
Rocks of largely unknown composition
and provenance (likely perl-Gondwanan)
Wiggins -Suwannee suture
Alleghanian deformation obscured by failed rifting
and deposition of Triassic -Jurassic sediments of the
South Georgia basin, Joins East Coast magnetic
anomaly.
Suwannee terrane (Gondwanan provenance)
(units and configurations after Thomas, 19E9)
Ordov;ciar�Devoniaa sedimentary rocks
Neoproterozoic Cambrian I'DIsia volcanic rocks
Supracrus tat (low grades components
Neoproterozoic deposition and volcanism
to Ordovician deposition.
Middle Proterozoic Rokelides basement and
African(?) crust (central Appalachians,.
�w `:; y�
,o_ -.'1
ea er
�� � 1 E •. � JJ Ch st a per �Gw _-_. - e � 1.
0_ \ _1. t � r1� •�. f �+ e
\ o
ck ~t .b Cartersvill GA TN arc, - s v,,rf -e� Yo
v �`\�'616
X Ysa�ets Mir by N
-• • "� �Roa r rC
DCjWW
�
. _ �...
o
NA T\/. QR_.V 1p�At�l'�tlto TV19q groe' a� '� ♦i l CS ���
' ; �- •__ ' "�-o- �d \- o - .� � �'°s Q � nP
.�• `A L. A \ TFd
o_ o � o- �'� .�• - _ --��,, . � _ _--` f; 'y �P� \ r.`� d �` dyer; t „ • ,
` II•'-.O •-••-� V•i_•%}�e Mtn. _�� /� ', j CFgf rrq�� Bur[svil
�M
C _,7
QQ _
Piedmo4t.
nt
o. c o. o _o �•.•C'
1s _i�: is o ti �_— - 1�•0 ��i � �� � -� '.
NW
%o _��•o -�.o _•..o _� ,_.
a
o- Y o •tee- 1v ' o ;o)41846—.1— Orb
Vo- •'� �- Y b \ fir• ��� �` �! 1�1 S C `� GH-Slf
. =a.at► o _ ;._o- C ;•'�'`
rtip' p e r ter a
Alabama
FL GA `�-•-o,, o �_ -o,t -o ♦.�•_. \Columbia I\I V Cf,\DC1\4U
--�- • •_ •_ •� o •- •rt . ti •- ��
ttii- \ cJ a
♦rtT •.C.• ;•Z-D of \
r
006,
�e _ -- ---
r
��= •=: o..= •o •�: Abbreviations and Symbols
• 1 5! _
' _ O�` �� IrIOC • �a
Aa Alto
8Bw - Brasstown Bald window (GA)
1`
` O • -D a •-• -n b • -
/
- allochthon (GA)
Av- AvondalemassitPA
( )
l 1- • •- . D •- •'- . -al,o
-y •o
Crt. terr. - Carioogechaye terrane (GA -NC}
DROw -Dog River- Dpeliha window (AL -GA)
•�
I `
o-, 0-.
Ogb - Dahfonega gold belt INC-GA)
GBMw -Great Balsam Mountains window (NC)
.o_ .D `_. .�e
hBu - Honey Brook upland(PA)
GMw - Grandfather Moumain window (NC)
- p • - q • - •
t1'o,_.�•-•o:.-._•-b;_`•-'o.-
h'c - Hamburg complex (PA I
L Cw - Limestone Cove whdow (TN)
O . , • -
�' '- • '- '- -
KM g
MCw - Mountain City window jTN)
• • o _ •
� � � c y o y o - o
`moo_ Z • o_ f + . o_O + .
Mm R - Mine Ridge assif (PA)
Td - Toxaway dome (SC -NC)
Nw - Newton window (NC;
•D _'�� _
• • o •
TFd- TallalahFalls dome (GA)
SCw- Shooting Creek window (NC -GA)
- O •'-O
•� !
WC - West Chaster massif (PA)
SMw - Sauratown Mountains window (HC)
• �o_• - —o • - = o a • -
'Q 'o
Wm - Wilmington complex (DE -PA)
TCw - Tuckaieechee Cove, Cades Cove,
` • o • ti .'4
Wr - Whitmire reertrant (SC)
and WearCove windows (TN)
NOTE. The Warne fault or /. Is nor used wf;h
F- Eelogitelocality
' . _ o :
names of hurts !n the Valley and Ridge of Plateau-
-._,
' ` . o •'lissm~
aaior subsurface boundary
Bah basod
largely
Subsurface boundary-� onaeioMagn.h�
d,[a
31
• ` we
Dextral strike•slipfauh
-
� _
CB13 = Chesapeake Bay impact structure
o 79
rhrust fault
•�'' �•
• `
Inner P!edrrtont Structure
Normal fault
3 O c'
Extent ofSalma Salt
......
/r Flow hno (7) derived from
'^^...(AlryheayPlateauWY-PA-NY)
\ / aeromagnefc data
_ `
v
traces of anticlinal hirges
o
rAlleghAtty Plates" WV -PA -NY)
r1
o 100
kilometers
78 ?� Flow lure d rived from
T ` Speculated thrust (AL-GAborder) l mineral lineation
�
Speculated subsurface extent cf the Central Piedmont suwre
beneath Carolina suporterrana SEof the Abbeville thrust sheet (SC -MC)
o 100
1
miles
NOTES:
1. HATCHER, R. D. JR., BREAM, B. R., AND MERSCHAT, A. J., 2007, TECTONIC MAP OF THE SOUTHERN AND CENTRAL APPALACHIANS: A TALE OF THREE OROGENS AND A COMPLETE WILSON CYCLE, IN HATCHER, R. D., JR, CARLSON, M. P.,
MCBRIDE, J. H., AND MARTINEZ CATALAN, J. R., EDS., 4-D FRAMEWORK OF CONTINENTAL CRUST: GEOLOGICAL SOCIETY OF AMERICA MEMOIR 200, P. 595-632.
77C, .
{
76° x
33 75o 340
__v
J I C H I" I J l iy l l V I V •`""ry'p�
Af - Allatoova fault (GA)
AgF- Augusta fault (GA -SC)
Ast - Ascauga fault (GA -SC)
BAf - Box Ankle fauk (GA)
BFF- Bart/efts Ferry fault (AL-GAI
Bsz - Bogertown shear zone (NC -SC)
CFAf- Craole of Forestry in America fault INC)
CGMf - Chunky Gat Mountain fault (GA -NC)
GbF- Greenbrier fault (NC -TM)
G1�SW - Gold Hill -Silver Hill faults (NC -SC)
GRf- Goat.4ock fault (AL -GA)
GSf- GreatSmoky fault 'NC-TN-3A)
Hf- Hayesvllle fault (locally the Iapetus suture) (GA -NC?
HMf- 1.lolston Mountain !ault(TN-VA)
1Mt- iron Mountain fault [TN -VA)
KMsz -Kings Mountain shear zone (NC -SC)
LFf- Linville Falls fault (VC)
MCf- Miller Cove fault, and equivalents (TN -GA)
MSf - Mill Spring fault (GA -SC -NC)
NCI- Nutbush Creek fault (NC -VA)
PG-HV- Pleasant Grove -Huntington
Valley shear zone (PA -MD)
PW - Paris Mountala fault (segment of Brindle Creek fauft) (SC)
Rsm - Rosemont shear zone (PA)
SFf - Shope Fork fault (NC)
SW- Six Mrle fault (SC-11c)
SAW- Sturrphouse Mountain fault(SC-NC)
Spf- Spotsflvania fault (VA)
SRr - Soque River fault (GA -NC)
SWI - Stone Wail line fault (AL -GA)
YBr- Yellow Breeches thrust(PA)
35°
TECTONOSTRATIGRAPHIC MAP OF THE
SOUTHERN AND CENTRAL APPALACHIANS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
GASTON COUNTY, NORTH CAROLINA
5-1

+r
,- hr4 '' �,#.:h�jly1 }�{` h. i!A Q � r. � PAP . � � N - . • .
r "f .F
r d s
r
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r 7r+err
,
!� F
7r
dh.�M Ire r' i'1 'r' ei
•
r
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r � 9+ c l '� irk' Pq • - • • rC7�q� A I, 7� ly
Ar
ry
Property Line
� t� ft �y��r�4?r4 r ;'!� �' rf• {r k' .y ^ ri� �'.' y°•P. zew�
14 4• rj a ,�Y)r r C �n � Y' _~� , ,� r���,;
A h
f 1k
r +
.413
r }
u,�v, P� � r,��.r $ �.�� f�� r+�•rR{41 fi sr .. ,vr;+ •.:: �� �F�,� � 1.
rp`. it ° k.i iy p } a�4"7 r "3 I •+ 1��!'6'h ry:w
EONi4�rP �L'f��� ' �Y.+Yk � i•' / py�• n.�f Q •r. ra r,
My
r N
r ` {din } � • �� f � �'is
r
w
• •
and tonalite
f
• • • •Carolina,•1 rr, i *r
+.
iii i 5,000 10,000 r
REGIONAL GEOLOGIC MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
5-2

SOIL
Regolith
ZONE
unsaturated
1
zone
_ Water table �
REGOLITH
Regolith
RESIDUUM
saturated
zone
TRANSITION
ZONE
WEATHERED
BEDROCK
P �
f�
UNWEATHERED
BEDROCK
r
ti
\�
t
FRACTURED BEDROCK
,
1
SHEETJOINT
r �
� I
BEDROCK
'
STRUCTURE
FRACTURE
ti
NOTES:
1. HARNED, D.A. AND DANIEL III, C.C.
1992. THE TRANSITION ZONE BETWEEN BEDROCK REGOLITH: CONDUIT FOR
CONTAMINATION?, P. 336-348, IN
DANIEL, C.C., III, WHITE, R.K., AND STONE, P.A., EDS.,
GROUNDWATER IN
THE PIEDMONT: PROCEEDINGS OF A CONFERENCE ON GROUND WATER IN THE PIEDMONT
OF THE EASTERN
UNITED STATES, OCTOBER 16-18,
1989, CLEMSON UNIVERSITY, 693P.
INTERCONNECTED TWO MEDIUM PIEDMONT
GROUNDWATER SYSTEM
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
5-3
GASTON COUNTY, NORTH CAROLINA

'4 LAND
SOIL { SURFACE
SAPROLITE
p ppp00o oGc �Q%Jn
TRANSITION ZONE /�����OQQp�1021 �(JIKVIX ,
l � v
711,
�D
BEDROCK
I
a) Foliated/Layered Bedrock
B LAND
SOIL {; 1.:.,;:;.:.;.
SURFACE
SAPROLITE
INDISTINCT I �'-; ; „ ` , „ •, ; _ :? `,
TRANSITION ZONE -' •" ;' - '
l_ L•., ,1�,' " _' 1 ,I r, _! I'il. \II4� ' ` j/r,_il\-� Ir.
BEDROCK
b) Massive/Plutonic Bedrock
NOTES:
1. HARNED, D.A. AND DANIEL III, C.C. 1992. THE TRANSITION ZONE BETWEEN BEDROCK REGOLITH: CONDUIT FOR
CONTAMINATION?, P. 336-348, IN DANIEL, C.C., III, WHITE, R.K., AND STONE, P.A., EDS., GROUNDWATER IN
THE PIEDMONT: PROCEEDINGS OF A CONFERENCE ON GROUND WATER IN THE PIEDMONT OF THE EASTERN
UNITED STATES, OCTOBER 16-18, 1989, CLEMSON UNIVERSITY, 693P.
F�2
CONCEPTUAL VARIATIONS OF THE TRANSITION
ZONE DUE TO ROCK TYPE STRUCTURE
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
5-4
GASTON COUNTY, NORTH CAROLINA

Slope Aquifer Boundary and Topographic Divide
Discharge Boundary
- - - - - - Compartment () Boundary
................ Water Table
=� Fractures
Groundwater Flow Direction
NOTES:
1. LEGRAND, H.E. 2004. A MASTER CONCEPTUAL MODEL FOR HYDROGEOLOGICAL SITE CHARACTERIZATION IN THE
PIEDMONT AND MOUNTAIN REGION OF NORTH CAROLINA, A GUIDANCE MANUAL, NORTH CAROLINA DEPARTMENT
OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY, GROUNDWATER SECTION, 50P.
F)l
PIEDMONT SLOPE -AQUIFER SYSTEM
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
5-5

NOTES:
1. ASH BASIN WASTE BOUNDARIES AND ASH STORAGE AREA BOUNDARIES ARE APPROXIMATE..
2. ORTHOPHOTOGRAPHY IS FROM NC ONEMAP GIS ONLINE SERVICE.
3. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107(a).
4. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS CHESNEE, NC -SC, AND BOILING SPRINGS SOUTH, NC -SC.
5. DUKE ENERGY PROPERTY BOUNDARY WAS SUPPLIED BY DUKE ENERGY REAL ESTATE.
6. BASED ON GEOLOGIC MAP OF THE CHARLOTTE V x 2' QUADRANGLE, NORTH CAROLINAAND SOUTH CAROLINA (GOLDSMITH, MILTON, AND THORTON, 1988)
7. SERVICE LAYER CREDITS: NC ONEMAP, NC CENTER FOR GEOGRAPHIC INFORMATION AND ANALYSIS, NC 911 BOARD
SCALE (FEET)
500 0 500 1,000
0
F)l
Legend
GEOLOGY
(DScgb) Gabbro of the Concord Plutonic Suite -
Gabbro, norite, gabbronorite, and hornblende
gabbro; major minerals are plagiobclase, both
clinopyroxene and orthopyroxene, and
hornblende, olivine or quartz
(DOgm) Metagranite and Metagranodiorite - Very
light gray to pinkish -gray, medium- to coarse -
grained, foliated, metamorphosed biotite granite,
biotite granodiorite, and hornblende-biotite
granite at Mountain Island, N.C.; coarse -grained
phase is characterized by euhedral, zoned
plagioclase crystals and mosaics of highly
sutured quartz grains
(mgb) Metagabbro - Dark, coarse -grained;
abundant amphibole replaces olivine and
pyroxene, although relicts of these minerals
occur; epidote is common, biotite and spinel may
be present; plagioclase is less abundant than the
mafic minerals; quartz is rare or absent
(mqd) Metamorphosed Quartz Diorite and
Tonalite - Gray, usually medium- to coarse -
grained, generally foliated rock composed
dominantly of plagioclase, quartz, biotite,
hornblende, and epidote. Biotite, hornblende, and
epidote commonly associated in clots replacing
original mafic phenocrysts; clots may be smeared
out, thus defining foliation
OUTCROPPINGS
ID Metadiabase
Q Metadiorite
TOP -OF -ROCK AT BORINGS
❑ Gneiss
■ Metadiabase
❑ Metadiorite
Contacts - Solid where approximate; dotted where
concealed
— — — DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
—COINCIDENT WITH DUKE ENERGY
PROPERTY BOUNDARY
SITE GEOLOGIC MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
6-1

; mo�
tr
al
R b "1 1. Pf T y ✓
' P' F�.�-4+�•.- ?-r h'r. ,�. - _i_.��.4 .yr-°.q•. �,
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r
rt
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i
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h
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i
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i
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r l
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,e
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RIVERBEND
TEAM STATr
T
y, M
LTORA
a3- f
k72
qp
If
NOTES:
1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE.
2. ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE.
3. AS -BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY.
4. SHALLOW MONITORING WELLS (S) - WELL SCREEN INSTALLED ACROSS THE SURFICIAL WATER TABLE.
S. SHALLOW LOWER MONITORING WELLS (SL) - BOTTOM OF WELL SCREEN SET AT THE ASH-REGOLITH INTERFACE.
6. INTERMEDIATE MONITORING WELLS (1) - WELL SCREEN INSTALLEDIN REGOLITH BELOW WATER TABLE AND BELOW ASH IN ASH BASIN.
7. DEEP MONITORING WELLS (D) - WELL SCREEN INSTALLED IN THE TRANSITION ZONE BETWEEN COMPETENT BEDROCK AND THE REGOLITH.
8. BEDROCK UPPER MONITORING WELLS (BRU) - WELL SCREEN INSTALLED IN COMPETENT BEDROCK IN THE FIRST 15 FEET WHERE NO TRANSITION ZONE EXISTS.
9. BEDROCK MONITORING WELL (BR) - WELL SCREEN INSTALLED IN ROCK FRACTURE ZONE WITHIN COMPETENT BEDROCK.
10. TOPOGRAPHY DATA FOR THE SITE WAS OBTAINED FROM NC DOT GEOGRAPHIC INFORMATION SYSTEM (GIS) WEB SITE.
11. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
12. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L .0107 (a).
13. SEEP SAMPLING LOCATIONS WERE OBTAINED BY HDR USING A TRIMBLE HANDHELD GPS UNIT ON APRIL 29, 2014.
14. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS MOUNTAIN ISLAND LAKE, NC.
* INDICATES SEEP SAMPLING LOCATIONS WERE NOT RECORDED WITH GPS UNIT AND ARE APPROXIMATE.
3 _ rr
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y
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i
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t!
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SCALE (FEET)
150' 0 /50' 300'
/" = 300'
3
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'P irk Y �1 > or
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.IF -.
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orr
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MMIL
t� •.
� •� ,w,�a+"fir 'y r r 1 „ � y'T "v
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_ -•IEEE.' t 3^ - _ _ , e . _ E. � ip ..C: _w�l•- 3�'.. ,
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r
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-yam _='�"-i.''�'�J►�'+�•�9.°�-��:Fr�:
Ps•
LEGEND:
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH OR CINDER STORAGE AREA BOUNDARY
_
STREAM
— — — — — — — — — —
— TOPOGRAPHIC CONTOUR (4 FOOT)
EXISTING ASH BASIN VOLUNTARY GROUNDWATER
MONITORING WELL
EXISTING ASH BASIN COMPLIANCE GROUNDWATER
MONITORING WELL
GROUNDWATER MONITORING WELL LOCATION
.
OBSERVATION WELL LOCATION
SEEP SAMPLE LOCATION
SURFACE WATER SAMPLE LOCATION
MONITORING WELL AND SAMPLE LOCATIONS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
6-2

NOTES:
1. BASE MAP FROM MOUNTAIN ISLAND LAKE, N.C. AND LAKE NORMAN SOUTH, N.C. USGS 7.5-MINUTE TOPOGRAPHIC QUADRANGLES
t tom` — f-
yl
_ •f
` e�=j'4-•\ !�}� �-- '' ��'}' \ � `' 1, -T'-�r •`l..•Y t ( �,/"1; r � 1 1u� r _ •�F �,s� i ;c., t �J , o � ,1; —, l
�%
i �.• ` �. ;'YfJf S 1 !%��tJ.lw "-" n ! / � 1. + I��llr.l\t� � i ! �1 �5�� _ �1'1
1 2 0 1 MILE l I�
5r7 MN
f GN 1000 0 100TJ 2000 3000 4000 5000 6000 7000 FEET
Topographic 1 5 0 1 KILOMETER
lineament Who, 1 N11� 0*02 _
CONTOUR INTERVAL 10 FEET _,•I ,
1 MIL �
NATIONAL GEODETIC VERTICAL DATUM OF 1929 L
-'�rt-o Base map: Mountain Island Lake, N.C. and Lake Norman
UTM GRID AND 1996 MAGNETIC NORTH f
` DECLINATION AT CENTER OF SHEET %
� 4 ;;� �� � •, - South, N.C. USGS 7.5-minute topographic quadrangles � -
°� J .�h vJM1\M Vr� `r� i ,I ,4S�` �� " fir \ � `" r"� 1� c ` ; � • `. : �[ }'�; -
TOPOGRAPHIC LINEAMENTS
AND ROSE DIAGRAM
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
GASTON COUNTY, NORTH CAROLINA 1 6-3

iIAL P H OTOG F
D ROSE DIAGR,
IIII:ll=a►l 12ONevaK±l6110

GWA3SAr'7-- S C2S
645.52' , 646.21' FtiF Ila,
MW15 MW3S
643.74' MM 2 645.06'
NR GWA10S
e643.79'
MW11 SR
664.68'
645.1
MW10
643.74' ,�
16'
MW13
643.07'
\111 141 6.55'
9.73' GWA9S
--0'648.24'
BG3S
644.96'
BG2S
651.82'
.670.96'
I�VVHz)J V ° 715.45' v
710.41'
GWA22S 712.92'
GWA20S
NR MW8S 709.86'_� .
GWA23S MW81 707.16'
705 89
s it
_,"T.. ., �: ,. d _.,:+'•ii-aid � '

cx a
MW15D
643.84'
\ MW4D
�MVV3D V647.32'
65274'5'
MW5D
MW1�1 DR 647.66'
66�4.59' AB 1 D
66�6.2
�fV1W2D , e
��'li 687.39' \ �MW6D
�/
yob` roh � F �. GWA�9D
�O AB2D 653.78
AB4D
678.41'
' �
a 702.91' GWA8D
� 671.08\ �d° BG3D
401 MW1 D AB3D 700.2' 644.85'
649. AB5D 6s�
�677:1.3'
MW9D FLAW GWA7D
GWA3D 647.93' 670.98'
645.5' BG2D
AB8D
647.96'
658.58' :
- - AB7D
C2D 713.48'
653.38' 66s.
MW7D
��y GWA6D
714.74' 714.4' os,
./ASlAS1 D AS2-p
D ' 6-9 4 AS3D BG�1 D
: 712.53' GWA5D 6744'
NR
66 ,/ GWA23D GWA22b
G�WA4D�y704.94' _ 709.29'
673.88U
GWA20D
MW8D
NR 705.55' `
wVK_n..
) fi.
S r�
;I
-
°."T.. , _., �: , � n�.�`. ,. d '_.:+' •ii-aid ` -.

MW15BR
643.95'
GWA10BRU
643.92
GWA1 BRU
662.07' r
GWA9BR
541.34'
GWA2BR
GWA2BRU ' 645.24'
QNA
' 4 �
ez
AB3BR
ado
583.67'
p
Joao
MW9BR AB6BRU
GWA7BR**-
648.72' 66' 663.59'-
BG2BR
-�
693.83'
Cl BRU �'Ve roso �
=A7BR
671.01'
549.33'
r 700�
MW7BR
711.76'
r
r
GWA4BR
:=
1�
�- ✓�
..
GWA20BR GWA22BR
N R
NR -
GWA23BR
.vn
nM
703.38'
... r
i
s
n
e
500 0 500 1,000
SCALE (FEET)
POTENTIOMETRIC SURFACE — BEDROCK WELLS (BRU AND BR)
(7/8 - 10, 2015)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
6-7

Afk
lw
rc �
ti
wl
�`` �;�T ` �•+"� � '"'.` �"� Lair •
�A, f
v'
IL
or 1p
r �
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{ � * r *�i �'� Y�� �� rM � �.. ., y "� � �"' _ t j � _ c�� tee• ^�.
9 /p.�U � �t .1 ? trt � yq_:I ,� ✓` - .L•'`, jT,:p. 9.,. *� F,i� /
•�.- ? __+'`�'�. '.*•��'� -��c'' /'4�;• `�" �`;�•�',': ,; �`: ,. _ j'"-.. max, �,fP.. J
500 0 500 1, 000
SCALE (FEET)
SOURCE CHARACTERIZATION SAMPLE LOCATION MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
LEGEND:
SEEP AND SEDIMENT SAMPLE LOCATION
SURFACE WATER SAMPLE LOCATION
A NCDENR MARCH 2O14 SAMPLE LOCATION
Q� POREWATER SAMPLE LOCATIONS
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
— — — , - DUKE ENERGY PROPERTY BOUNDARY
STREAM
N
DATE
AUGUST 2015
FIGURE
7-1
GASTON COUNTY, NORTH CAROLINA

i
,< Y � 1 : {t �e . "'� _ - • �rt. 'L.- S� f r� _ 'tir=- . ✓� t � ._ +r
.1 Y}} - _ . ff " •iI'F, �P ifs
i i _ • P' r r
_ w 9
7 c
IL
1146
or
Ap—
.i
3^ SI
k y,
p" le it .. rN J - � .. �' ,��! • '� » #4 `Mr' ,icy
r -
,
�r � . . y5. . . . . i. � _ 4 �' ^ T • 1�„ �,�.- ► r q ti Vim,
j
t
s _ r
• Y
y •
1 � W
Y 7
51 , *41Art
J +F>
OOAP
CINDER
STORAGES .
• C + /,/ ^'
ASH
`.I
NOTES:
1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE.
2. ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE.
3. TOPOGRAPHY DATA FOR THE SITE WAS OBTAINED FROM NC DOT GEOGRAPHIC INFORMATION SYSTEM (GIS) WEB SITE.
4. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
S. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L .0107 (a).
6. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS MOUNTAIN ISLAND LAKE, NC.
'ti H N
- -. --wows
SCALE (FEET)
200' 0 200'
400'
r(
Irl
m U
4 00'
of
-" _
git,.
rt
*sir
b& ja�
h�
R>I
rt' F .yi.
ffi r
fir. — •. �� ;ya : �..."'s .'� ��- r ► 3rr
■ 1
f 1'`
LEGEND:
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH OR CINDER STORAGE AREA BOUNDARY
STREAM
TOPOGRAPHIC CONTOUR (4 FOOT)
NCDENR MARCH 2O14 SEEP SAMPLE LOCATIONS
NCDENR MARCH 2O74 SAMPLE LOCATIONS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
•
FIGURE
7-2
GASTON COUNTY, NORTH CAROLINA

77*1,_,.,
2, 000 0 2, 000 4, 000
SCALE (FEET)
A na lyte
CA S No.
NC PSRG Ind'
NC PSRG Prot GW 1
Aluminum
7429-90-5
100,000
NS
Antimony
7440-36-0
94
0.9
Arsenic
7440-38-2
3
5.8
Barium
7440-39-3
44,000
580
Beryllium
7440-41-7
460
63
Boron
7440-42-8
46,000
45
Cadmium
7440-43-9
200
3
Chromium*
16065-83-1
100,000
360,000
Cobalt
7440-48-4
70
0.9
Copper
7440-50-8
9400
700
Cr(VD
18540-29-9
6.3
3.8
Iron
7439-89-6
100,000
150
Lead
7439-92-1
800
270
Manganese
7439-96-5
5,200
65
Mercury
7439-97-6
8
1
Molybdenum
7439-98-7
1,200
NS
Nickel
7440-02-0
4,400
130
Nitrate
14797-55-8
100,000
NS
Selenium
7782-49-2
1,200
2.1
Silver
7440-22-4
1,200
3.4
Strontium
7440-24-6
100,000
NS
Thallium
7440-28-0
2.4
0.28
Tin
7440-31-5
100,000
10,000
Vanadium
7440-62-2
1,200
6
Zinc
7440-66-6
70,000
1,200
* Chromium standard shown is for Chromium III for comparison.
No available standard for Total Chromium.
All units shown in mg/kg.
1 - North Carolina DENR Inactive Hazardous Sites Branch - Preliminary Soil Remediation Goals
(PSRG) Table (March 2015). Industrial Health Based Soil PSRG and Protection of Groundwater
PSRG shown for comparison.
NOTES:
U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMIT
J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN THE LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
mg/L: MILLIGRAMS PER LITER
pg/L: MICROGRAMS PER LITER
BOLD: EXCEEDS INDUSTRIAL HEALTH STANDARD
UNDERLINED & ITALICS: EXCEEDS PROTECTION OF GROUNDWATER
BOLD, UNDERLINED & ITALICS: EXCEEDS BOTH INDUSTRIAL HEALTH STANDARD
& PROTECTION OF GROUNDWATER
LEGEND
ASH BASIN ASSESSMENT GROUNDWATER
MONITORING WELL
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH STORAGE
DUKE ENERGY PROPERTY BOUNDARY
SOIL ANALYTICAL RESULTS - PLAN VIEW (PSRG EXCEEDANCES)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
N
AUGUST2015
FIGURE
0
GASTON COUNTY, NORTH CAROLINA

1 I 2 I 3 I 4 I 5 I 6 I 7 I 8
A
SOUTHWEST
800 r-
700 ; 4
GWA-4D GWA-4BR
41
4-
z
0
a
w
w
mil
GWA-4D
Sample
Wepth (ftj
118-119.5
PWR
Anal tInganesel
mg/kg
iron
212
50(
AS-1D
Sample De th ft
3.5-5
33.5-35
73.5-75
83.5-85.5
F 88.5-90.5
Ash
Ash
Ash
Sail
Soil
Ana e / k
Arsenic
69.2
31.9
33
"DNE
"DNE
Cobalt
11.4
8.4
7.5
5.1
5.2
Iron
9290
5240
9690
14400
7540
Selenium
2.5J
2.9J
2.5J
"DNE
"DNE
Vanadium
67.7
44.4
37.9
35.4
17.2
Manganese
"DNE
*DNE
74.2
170
194
,/
AS-1D� I ow
I I AS-1 S
11
L
12
GWA-4S
Sample Depth ft
15-19
24-26
32-35
34-36
Soil
Soil
Soil
Soil
Ana to / k
Cobalt
25.5
5.8-7
4,43
3.11
Iran
38700
10200
8190
4950
Selenium
5.61
-DPJE
-DIIE
"DNE
Vanadium
52.9
19.2
173
'°DIIE
Manganese,
.367
269
169
231
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
Sample Depth ft
3-4.5
Ash
Ana to m / k
Arsenic
40.6
Cobalt
9.6
Iran
6010
Selenium
01
Vanadium
54.1
Maricanese
-DPJE
AS-2D
Sample Depth (ft) 3.5-5
I Ash
Analyte (mg/kg)
Arsenic 101
Antimony Z2J
Cobalt 17.3
Iron 8340
Selenium 2.91
vanadium 95.7
1 Manganese *DNE
18.5-20
7 23.5-25
28.5-30
30-31.5
Ash
soil
soil
Soil
62.7
"DNE
"DNE
10.9
11.2
5.9
6.1
3.7
62701+
12200
12900
14300
37
-
"DNE
"DNE
"DPJE
84.2
33.6
37.3
44.4
*DNE
313
276
85
I AS-2D
800 1000 1200
DISTANCE (ft)
SECTION A
SCALE: HORIZ 1 "=100' rIG 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
1400
AS-3D
---------III--
1600
NOT FOR
CONSTRUCTION
I %_
AS-3D
33.5-35
1 43.5-45
1 53.5-55
58.5-60
Ash
Ash
Soil
Soil
61.2
67.2
&6
*DNE
'DNE
*DNE
*DNE
*DNE
9
9_9
5_2
8_3
6820
8360
16900
11100
3.2 J
3.1 J
*DNE
*DNE
52.1
56.5
46
21
*DNE *DNE 127 793
N 0 RTH EAST
800
R ow
i` J
1800
MW -------
jw
4W
2000
N
CV
I
00
LlJ
CD
LL_
n
ii
t
2
U
Q
MGM
--1 500
2200
DUKE ENERGY CAROLINAS.LLC
10' DUKE
�14_ ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
ANALYTE
NC PSRG Ind'
NC PSRG Prot GW'
ALUMINUM
100,00
NS
0-9
94
-BAK-ANTIMONY
BORON
46,000
45
CADMIUM
200
3
CHROMIUM*
100,000
360,000
COBALT
70
0.9
COPPER
9,400
700
Cr VI
6.3
3.8
IRON
100,000
150
LEAD
800
270
MANGANESE
5,200
65
MERCURY
8
1
MOLYBDENUM
1 200
NS
NICKEL
4 400
130
NS
2.1
NS
NITRATE
100,000
SELENIUM
1,200
1.
STRONTIUM
1 0Dj2QL_
TIN
100,000
10,000
VANADIUM
1,200
6
1,200
ZINC***
70,000
*Chromium standard shown is for Chromium III for
comparison.
No available standard for Total Chromium.
All units shown in mg/kg.
1- North Caroilina DENR Inactive Hazardous Sites
Branch - Preliminary Soil Remediation Goals
(PSRG) Table (March 2015). Industrial Health
Based Soil PSRG and Protection of Groundwater
PSRG shown for comparison.
NOTES:
U = NOT DETECTED ABOVE LABORATORY REPORTING
LIMIT
J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
PSRG: PRELIMINARY SOIL REMEDIATION GOAL
FT: FEET
MG/KG: MILLIGRAMS PER LITER
iuG/L: MICROGRAMS PER LITER
BOLD: EXCEEDS INDUSTRIAL HEALTH STANDARD
UNDERLINED & ITALICS: EXCEEDS BOTH INDUSTRIAL
HEALTH STANDARD & PROTECTION OF
GROUNDWATER
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >t 50% OR REC 5 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION A -A'
SOLID MATRIX ANALYTICAL RESULTS
0 1" 2° FILENAME FIGURE 8-2.1.DWG
SCALE I AS NOTED
D
C
0
IA
SHEET
FIGURE 8-2.1

1
2
3
2
5
A
7
SOUTHWEST
800
N
00
W
Ix
C�
LL_
41
Z
0
a LL1
J
w
2
U
Q
600
AB-7D
Sam le Depth ft
3.5-5
8.5-10
23.5-25
28.5-30
Ash
Ash
Soil
Soil
Ana to (mg/kg
Arsenic
26.7
68.3
*DNE
24.6
Antimony
*DNE
2J-
"DNE
"DNE
Cobalt
8.3
11.8Jt
*DNE
4.7
Iron
6790
8240
7830
21200
Vanadium
40.9
77.8
58.2
56.3
Manganese
*DNE
88.5
1 *DNE
119
AB-7S
Sample Depth ft
18.5-20
Soil
Ana to / k
Arsenic
35.1
Cobalt
8.3
Iron
16400
Selenium
2.4J
Vanadium
66.9
Manganese
159
AB-7S
500 = -
2200 2400 2600
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
2800
ISSUE DATE DESCRIPTION
3000
AB-3D
Sample Depth ft
3.5-5
38.5-40
1 48.5-50
68.5-70
Soil
Ash
Soil
Soil
Ana to /k
Arsenic
"DNE
35.6
33.8
26.5
Cobalt
"DNE
4.53
4.1 J
4.1 J
Iron
76201
9710
7220
17900
Vanadium
18.1
39.7
47.9
9AB_3S
3BR
AB-3NTERMEDIATE DAM
3200 3400
DISTANCE (ft)
3600
SECTION A
SCALE: HORIZ 1 "=100' FIG 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
WATER
IN BASIN
3800
NOT FOR
CONSTRUCTION
4000
4200
A'
N 0 RTH EAST
500
4400
DUKE ENERGY CAROLINAS.LLC
10' DUKE
�14_ ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
ANALYTE
NC PSRG Ind'
NC PSRG Prot GW'
ALUMINUM
100,00
NS
0-9
94
-BAKANTIMONY
BORON
46,000
45
CADMIUM
200
3
CHROMIUM*
100,000
360,000
COBALT
70
0.9
COPPER
9,400
700
Cr VI
6.3
3.8
IRON
100,000
150
LEAD
800
270
MANGANESE
5,200
65
MERCURY
8
1
MOLYBDENUM
1,200
NS
NICKEL
4,400
130
NS
2.1
NS
NITRATE
100,000
SELENIUM
1,200
SILVER
1.
1 0Dj2QL_
TIN
100,000
10,000
VANADIUM
1 1 200
6
1,200
ZINC***
70,000
*Chromium standard shown is for Chromium III for
comparison.
No available standard for Total Chromium.
All units shown in mg/kg.
1- North Caroilina DENR Inactive Hazardous Sites
Branch - Preliminary Soil Remediation Goals
(PSRG) Table (March 2015). Industrial Health
Based Soil PSRG and Protection of Groundwater
PSRG shown for comparison.
NOTES:
U = NOT DETECTED ABOVE LABORATORY REPORTING
LIMIT
J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
PSRG: PRELIMINARY SOIL REMEDIATION GOAL
FT: FEET
MG/KG: MILLIGRAMS PER LITER
iuG/L: MICROGRAMS PER LITER
BOLD: EXCEEDS INDUSTRIAL HEALTH STANDARD
UNDERLINED & ITALICS: EXCEEDS BOTH INDUSTRIAL
HEALTH STANDARD & PROTECTION OF
GROUNDWATER
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
' F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >t 50% OR REC 5 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION A -A'
SOLID MATRIX ANALYTICAL RESULTS
0 1" 2° FILENAME FIGURE 8-2.2.DWG
SCALE I AS NOTED
SHEET
FIGURE 8-2.2
C
Is]
4.1
I_1

1
2
3
2
5
A
7
7
W
11
800
700
650
C-1D
Sample Depth ft
3.5-5
1 8.5-10
1 13.5-15
23.5-2-5
Ash
Ash
Soil
Soil
Ana to m / k
Arsenic
34.9
47.8
"DrdE
' Dr4E
Cobalt
*DNE
' DNE
"Dr,1E
6
Iron
16100
20400
636
11500
Selenium
2.7J
37
' DNE
° DNE
Vanadium
10.6
13.3
15.2
233
Manganese
-*DNE
*DNE
° DNE
242
3
NEST
r
I
Sample Depth (ft)
Ana to (mg/kg)
Ira n
Q o i Vanadium
Q MancIanese
I �
�CD
c�
GWA-3S
550'
500 -
0
GWA-3D
18.5-19
Soil
5320
11.5
155
40-40.5
F %. -; R
4
;`D[]E
19 3. 9
400
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
C-1BRU C
M0
ISSUE DATE DESCRIPTION
-
OF
1000
AB-8D
n le Depth ft
90-90.5
P'u "iR
Edyte (mg/kg
Cobalt
31
Iro n
.5590
Vanadium
11.4
Nlan anese
130
1200 1400
DISTANCE (ft)
SECTION B
SCALE: HORIZ 1 "=100' rIG 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
1600
AB-8S
Sample Depth ft
13-15
20-25
Soil
Soil
Ana to m / k
Cobalt
`DNE
70.1
Cobalt
48.4
*DNE
Iro n
57500
50200
Boron
51.7
50
Vanadium
140
145
IM0111 0 a
r:langanese
1800
2000 2200
i
EAST
800
-5:3
700
2400
AB-5D
Sample Depth ft
3.5-5
28.5-31
48.5-50
1 58.5-60
63.5-65
Ash
Ash
Ash
Soil
Soil
Ana rn to / k
Arsenic
14.2
55.4
40
*DNE
*DNE
Arsenic
*DNE
*DNE
*DNE
3.53
3.71
Cobalt
3.8J
8.2J
8.4
16.2
6J
Iron
61.30
13500
19100
36600
37100
Vanadium
15.3
45.4
39
119
141
manganese
*DNE
*DNE
98.1
135
108
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINAS.LLC
10' DUKE
�14- ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
1 650
N *Chromium standard shown is for Chromium III for
in
comparison.
CO No available standard for Total Chromium.
Lv All units shown in mg/kg.
x
Z) 1- North Caroilina DENR Inactive Hazardous Sites
2 Branch - Preliminary Soil Remediation Goals
LL- (PSRG) Table (March 2015). Industrial Health
Based Soil PSRG and Protection of Groundwater
600 PSRG shown for comparison.
Z NOTES:
J U = NOT DETECTED ABOVE LABORATORY REPORTING
LIMIT
2 J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN LABORATORY REPORTING LIMIT
Q J+ = ESTIMATED CONCENTRATION BIASED HIGH
g J- = ESTIMATED CONCENTRATION BIASED LOW
PSRG: PRELIMINARY SOIL REMEDIATION GOAL
1550 FT: FEET
MG/KG: MILLIGRAMS PER LITER
iuG/L: MICROGRAMS PER LITER
BOLD: EXCEEDS INDUSTRIAL HEALTH STANDARD
UNDERLINED & ITALICS: EXCEEDS BOTH INDUSTRIAL
HEALTH STANDARD & PROTECTION OF
GROUNDWATER
-J 500
2600
ANALYTE
NC PSRG Ind'
NC PSRG Prot GW'
ALUMINUM
100,00
NS
-BAKU
BORON
46,000
45
CADMIUM
200
3
CHROMIUM*
100,000
360,000
COBALT
70
0.9
9,400
700
.COPPER
Cr VI
6.3
3.8
IRON
100,000
150
LEAD
800
270
MANGANESE
5,200
65
MERCURY
8
1
MOLYBDENUM
1,200
NS
NICKEL
4,400
130
NS
2.1
NS
NITRATE
100,000
SELENIUM
1,200
SILVER
1.
STRONTIUM
1 ODQQL-
--
TIN
100,000
10,000
VANADIUM
1 200
1 6
1,200
ZINC***
70,000
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
' F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >t 50% OR REC 5 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION B-B'
SOLID MATRIX ANALYTICAL RESULTS
0 1" 2° FILENAME FIGURE 8-3.1.DWG
SCALE I AS NOTED
SHEET
FIGURE 8-3.1
C
Is]
4-1
I_1

1
2
3
2
5
A
7
W
AB-4D
Sample Depth ft
3.5-5
43.5-45
48.5-50
58.5-61.5
Fill
Ash
Soil
Soil
Ana to (mg/kg)
,arsenic
"DIJE
20.9
-DrJE
*DNE
Cobalt
`DIJE
`DIJE
36.1
63.6
Nickel
'=DNE
°`DIJE
-DIJE
161
Iron
17900
3390
42400
19000
Vanadium
36,4
9.9
56.1
40.4
Man anew
*DIJE
`DIJE
485
3320
700
650
M
OU
z Lv
o Ix
a �
w
W:Yi1
W
Z
J
2
U
Q
550
500
2600
2800
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
3000
ISSUE DATE DESCRIPTION
3200
AB- 4S
Sam le Depth ft
53.5-55
Soil
Ana to rn J k
Cobalt
75
Iro in
41.E 00
WanadiLim
L�'1.0
I'vlanganese
1950
3400
3600
3800
DISTANCE (ft)
SECTION B
SCALE: HORIZ 1 "=40' rIG 11-1
VERT 1"=10'
PROJECT MANAGER S. SPINNER. P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
NOT FOR
CONSTRUCTION
4200
4400
DUKE ENERGY CAROLINASILIC
10' DUKE
�14_ ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
4800
B'
800
700
650
550
500
ANALYTE
NC PSRG Ind'
NC PSRG Prot GW'
ALUMINUM
100,00
NS
0-9
q4
-BAK-ANTIMONY
BORON
46,000
45
CADMIUM
200
3
CHROMIUM*
100,000
360,000
COBALT
70
0.9
9,400
700
-COPPER
Cr VI
6.3
3.8
IRON
100,000
150
LEAD
800
270
MANGANESE
5,200
65
MERCURY
8
1
MOLYBDENUM
1 200
NS
NICKEL
4,400
130
NS
2.1
NS
NITRATE
100,000
SELENIUM
1,200
SILVER
1.
1 QDJ2Q�L__
TIN
100,000
10,000
VANADIUM
1 1 200
6
1,200
ZINC***
70,000
*Chromium standard shown is for Chromium III for
comparison.
No available standard for Total Chromium.
All units shown in mg/kg.
1- North Caroilina DENR Inactive Hazardous Sites
Branch - Preliminary Soil Remediation Goals
(PSRG) Table (March 2015). Industrial Health
Based Soil PSRG and Protection of Groundwater
PSRG shown for comparison.
NOTES:
U = NOT DETECTED ABOVE LABORATORY REPORTING
LIMIT
J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
PSRG: PRELIMINARY SOIL REMEDIATION GOAL
FT: FEET
MG/KG: MILLIGRAMS PER LITER
iuG/L: MICROGRAMS PER LITER
BOLD: EXCEEDS INDUSTRIAL HEALTH STANDARD
UNDERLINED & ITALICS: EXCEEDS BOTH INDUSTRIAL
HEALTH STANDARD & PROTECTION OF
GROUNDWATER
IC
1we]
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
' F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >t 50% OR REC 5 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION B-B'
SOLID MATRIX ANALYTICAL RESULTS
0 1" 2,, FILENAME FIGURE 8-3.2.DWG
SCALE I AS NOTED
4.1
I_1
SHEET
FIGURE 8-3.2

1 1 2 1 3 1 4 1 5 1 6 1 7 1 8
l
750
700
650
4—
R
a
550
500
AB-4D
Sample Depth (ft)
43.5-45
48.5-50 58.5-61.5
Ash
Soil Soil
Ana lyte (mg/kg)
Arsenic
20.9
*DNE
*DNE
Cobalt
*DNE
36.1
63.6
Nickel
*DNE
*DNE
167
Iron
3390
42400
19000
AB-4S
Sample Depth (ft)
53.5-55
Soil
Analyte (mg/kg)
Cobaltj
75
Iron
1 41300
AB-3D
Sample Depth ft
3.5-5
38.5-40
48.5-50
68.5-70
Soil
Ash
Soil
Soil
Ana a /k
Arsenic
"DI-JE
35.6
33.8
26.5
Cobalt
'DHE
4.5J
4.1 J
4.1 J
GWA-7S
Sample Depth (ft}
7-8
Soil
Analyte (mg/kg)
Cobalt
73.8
Iron
58900
Vanadium
209
Mangano
1700
0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400
DISTANCE (ft)
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
SECTION
SCALE: HORIZ 1 "=120' rIG 11-1
VERT 1 "=30'
PROJECT MANAGER S. SPINNER. P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINAS.LLC
10' DUKE
�14- ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
750
700
650
M
550
500
C
Ce7
4-1
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH — ASH
F — FILL
S — ALLUVIUM A
M1 — SOIL/SAPROLITE; N < 50
M2 — SAPROLITE/WEATHERED ROCK;
N >t 50% OR REC 5 50%
TZ — PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR — SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION C-C'
SOLID MATRIX ANALYTICAL RESULTS
0 1" 2° FILENAME FIGURE 8-4.1.DWG SHEET
SCALE AS NOTED FIGURE 8-4

D
WEST
0r---
M
■ ITO
1
Sample Depth (ft)
3.5-5
Ash
Analyte (mg/kg)
Arsenic
14.2
Arsenic
*DNE
Cobalt
3.8J
Iron
6130
Vanadium
15.3
Manganese
*DNE
CATAWBA RIVER
MOUNTAIN ISLAND LAKE
2
AB-5D
28.5-30
48.5-50
Ash
Ash
55.4
40
*DNE
*DNE
*DNE
58.5-60
Soil
*DNE
3.53
I
PRIMARY DAM
MW-1S
3
63.5-65
Soil
*DNE
3.73
AB-6BRU AB-6S
Sample Depth (ft)
3.5-5
Ash
Analyte (mg/kg)
Arsenic
26.7
Antimony
*DNE
Cobalt
8.3
Iron
6790
Vanadium
40.9
Manganese
*DNE
2
AB-7D
8.5-10
Ash
23.5-25
Soil
*DNE
*DNE
*DNE
7830
58.2
*DNE
5
I 6
Sample Depth (ft)
Analyte (mg/kg)
Cobalt
Iron
Vanadium
GWA-6D
43.5-45
Soil
25.4
19000
55.8
48.5-50
Soil
10.5
18200
55.5
28.5-30
Soil
24.6
*DNE
4.7
0 200 400 600 800 1000 1200 1400 1600
DISTANCE (ft)
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
SECTION D
SCALE: HORIZ 1 "=100' rIG 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER. P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
NEI
NOT FOR
CONSTRUCTION
Manganese
AB-7S
Sample Depth (ft
18.5-20
Soil
Analyte (mg/kg)
Arsenic
351
Cobalt
8.3
Iron
16400
.ac�ci iiui i �
L,7 J
Vanadium
66.9
Mancianesel
158
1800
2000
7
I1
2200
DUKE ENERGY CAROLINAS.LLC
DUKE
=,. ENERGY.
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
Sample Depth (ft)
Analyte (mg/kg)
Cobalt
Iron
Vanadium
Manganese
W
MW-7BR
43.5-45
53.5-55
Soil
Soil
7.3 J
14.7
12.300 J
.?1000
r]
D'
EAST
800
MW-7BR
fl RI
W-7SR I I I I MW-7D
700
M
500
2400 2600 2800
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >- 50% OR REC 5 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION D-D'
SOLID MATRIX ANALYTICAL RESULTS
0 1" 2° FILENAME FIGURE 8-5.DWG
SCALE I AS NOTED
SHEET
FIGURE 8-5
C
Is]
4-1
I_1

1
2
3
2
5
A
7
E
NORTH
800
More
650
z
0
w
J
w MW_c
.o
AS-2D
E'
SOUTH
0 200 400 600 800 1000 1200 1400 1600 vv
DISTANCE (ft)
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
SECTION E
SCALE: HORIZ 1 "=80' rIG 11-1
VERT 1 "=40'
PROJECT MANAGER S. SPINNER. P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINAS,LLC
10' DUKE
�14_ ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
ANALYTE
NC PSRG Ind'
NC PSRG Prot GW'
ALUMINUM
100,00
NS
5.8
ARSENIC
3
j3AEU
BORON
46,000
45
CADMIUM
200
3
CHROMIUM*
100,000
360,000
COBALT
70
0.9
COPPER
9,400
700
Cr VI
6.3
3.8
IRON
100,000
150
LEAD
800
270
MANGANESE
5,200
65
MERCURY
8
1
MOLYBDENUM
1,200
NS
130
NS
2.1
10 000
6
1,200
NICKEL
4,400
NITRATE
100,000
SELENIUM
1,200
SILVER
1.
10
100,000
_THALLIUM
TIN
VANADIUM
1.200
ZINC***
70,000
*Chromium standard shown is for Chromium III for
comparison.
No available standard for Total Chromium.
All units shown in mg/kg.
1— North Caroilina DENR Inactive Hazardous Sites
Branch — Preliminary Soil Remediation Goals
(PSRG) Table (March 2015). Industrial Health
Based Soil PSRG and Protection of Groundwater
PSRG shown for comparison.
NOTES:
U = NOT DETECTED ABOVE LABORATORY REPORTING
LIMIT
J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J— = ESTIMATED CONCENTRATION BIASED LOW
PSRG: PRELIMINARY SOIL REMEDIATION GOAL
FT: FEET
MG/KG: MILLIGRAMS PER LITER
,uG/L: MICROGRAMS PER LITER
BOLD: EXCEEDS INDUSTRIAL HEALTH STANDARD
UNDERLINED & ITALICS: EXCEEDS BOTH INDUSTRIAL
HEALTH STANDARD & PROTECTION OF
GROUNDWATER
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH — ASH
F — FILL
S — ALLUVIUM
M1 — SOIL/SAPROLITE; N < 50
M2 — SAPROLITE/WEATHERED ROCK;
N >t 50% OR REC 5 50%
TZ — PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR — SOUND ROCK;REC >: 85% AND RQD >t 50%
CROSS SECTION E-E'
SOLID MATRIX ANALYTICAL RESULTS
0 1" 2° FILENAME FIGURE 8-6.DWG
SCALE I AS NOTED
SHEET
FIGURE 8-6
IC
Ire]
4.1
I_1

All
278.0
-.— W— I - . 4W-
AL imw�
tu
k
T
41
. ar
O
05F, a, .�4 6
00
71
XX
100
4k
--A- sw-1 400
S-3
S-10
v ASH BASIN C)l
0A+ /Vo
SECONDARY CELL S-11
Is
S-12
ASH BAS11
S-6
SW-2
71
S 7 277.5
ASH BASIN
PRIMARY CELL
Kt
S-- • -�f -a. � 1-�• -e. _�--:,�r,;,r,a -' �� me•µ j �\ e-'"���f`
S-1
/*
Af
x
SW-3 CINDER
o. STO RAG E < N
-0
x
OVA
irr
ASH
STORAGE
•
I � �/. 1, �; T����,y s � � �,� � / .-. = �' � .� \ t \ y1. l �..
V� NONE
mom
In HORSESHOE
BEND BEACH ROAD
mum wow
"III -IF
nano I
I/y.
pill
.1 A
N
�V
I 4fj,f I
J-Z
A, A,
01"A I Is

48 29 2
4 79 7V 211
y` k..
_ 176
_
4 17
6 �\5
- , 2222 1
ill 28234 9 11 � p 112
181
2-
93
Average arsenic concentration (pg/L)
wd
i
t 2=0 * �
2.6-5.0
4
106 44
13 5
14
82
Approximate location of Riverbend Steam Station
MEAN CONCENTRATION BY COUNTY OF ARSENIC IN NC PRIVATE WELL WATER IN 2009 (Ng/L)
ADAPTED FROM SANDERS ET AL. (2011)
F)l
15
I
17
63
ARSENIC CONCENTRATIONS IN GROUNDWATER
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
10-1

Concentration of Iron Detected are NC Private WeII Water (jig/ L), Average 2010
Concentration of i ron detected i n p ri vate we I I s� µ 1l. )
�
50.00 - Mo.fla
�
300.01 - 500.00
-
500.01 - 1,QOU.UO
-
1,000.01 - 12,4d0.U0
-
12,000_01-1,1U0,35B.35
A National Priorities List sites repo rti rig iroii
O Approximate location of Riverbend Steam Station
CONSTITUENTS OF INTEREST NEAR RIVERBEND STEAM STATION WITH
THEIR ASSOCIATED STATE AND FEDERAL DRINKING WATER STANDARDS
F)l
STATE AND FEDERAL WATER STANDARDS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
10-2

Manganese Concentrallons in Well Water ::.:..� .. , a' } --■---
� • ■ i
&lip or
r ...: ire^ . ♦♦ .. '
i • pia �- • . . . +, + • + -t . . • , * t • #� ■t
� • a`#,'Jeri• -�' .+.■ . ., • a tr ++• # • • .r
' *+* J*i'+i* aii *• ._.t• Fi. + • +i i ' W. '
do
:t**+t :i- a�• •'+ ; "=ft . ".1=# `.•,•- •No
t �.� � •�z -' + + . � � i ■ . ,+ .. '� . ++ ■ . + + t + t� • + . • of � + - � • *+ i + +# t �" • 4�ti
SOLI System r# •i; .�" •.
SfaCkish and Freshwater Marsh System Lower Coastal Plain - Wcomico and Talbot System
Broad Banns. Barer Terraces and Fbod Plain 5yst6M hAr4dle Cva5tal Plain System a *t+.. :+� :.'' �••' ; .
Carolina Slate Bell System Mixed Felsic and Mak System .F 1C'i * Mn 17
r:
040 • 1000
Felsic Crystalline System prgnrcfl System „ , 1 pD 1 - 2D0
- High Mountain System Ohuter Banks System i� --- - _-- _
Large Rrvv Valleys and Flood Plain System
andhilIS System
Ih 0 -i §00 0
Low and Intermediate Mountain System Tnassi-c Bann System � 3 v -
Lower �tal Plain - Piprrtli ystern Upper Coastal Elm- III and Predn oM S5Q0 1 1000.4
ystem -
Approximate location of Riverbend Steam Station
MANGANESE CONCENTRATIONS IN GROUNDWATER AND SOIL REGIONS OF NORTH CAROLINA
(GILLESPIE 2013)
F)l
MANGANESE AND SOIL REGIONS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
10-3

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dl� JM, , +V` • 1 ; ( ;f-
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AV
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41
.` �,\ H r .'�- •�!, � �d.. ��� ta.. _" �:.� _� �'ts� r, � t' _ . _ _ R .. 3a. : i' .< _-. - _. .,. I4r`�rJ, _
+'JW.
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lK
Legend
Riverbend Site
Manganese (pg/L)
e'2J5�'� •-r:, }'" - Rr -p�� � ti' 1 •:.""-, _ '�'sJ �� ���'l ��•, .. ... �.. �'r -�. t (f' � �1, -c I ;1' .'��r� t- ....
t 11
0.00-12.50
s •wJs 3'i t"s t �.}- v�A`�{ r '+1e►-t 'ti5^w"'�,,-s`�` `•sC):S_�i•_.Ryt ,ar _ - ,r ,ytK` ,. �_ _ _ _ _`i',a. p, •µ ,�YK r
� .' � b fit". '� �"�• ^'? w � s„
,'� ;f,�r . y.. ,�. 'r •'Y''1�sA F. f: ,.• "i;{!�;"j�.�,j +k�1�; r • ' r25.01 - 50.00 '
�� ,e �*`_` -�� � �1� �fi" � ^� }. � e. ��'' � A _ �'r Qy . '7� � " �.e� �y''7�; : ,� '�e1F ; : , � '�/�, 714 �a - , L «: �,� ` `. �' • _ t F
ti1:t, c'; lrt '»� i�r r.s+ •,.f. �.-�,st r'Y 11 1111 /
�r��� - - l,I•.r - . .�';r j �, � {il ••.��'., 1.'. .. .- )-- l s�. .F i_, ,. r '��: .; -�" ... .. - _ �t �•'-y ^' vy
IC
100.01 434.00

120OW
110°W
1000W
90°W
8;T' V1,
70�W
40°N
30O N
20O N
I
EXPLANATION
TI
PERCENTILE
mq/kq
90 to 100
0.7 to 4.3
70 to 90
0.6 to 0.7
50 to 70
0.5 to RE
40 to 50
0.4 to 0.5
20 to 40
0.3 to 0.4
10to20
0.2to0.3
0 to 10
¢0.1 to 0.2
• Approximate location of Riverbend Steam Station
base map from U.S. Geological Survey digital data
Lambert Conformal Conic projection
Standard parallels 33'N and WN
Central Meridian 96°W
Datum NAD 1983
THALLIUM CONCENTRATIONS IN C HORIZON OF SUBSTRATE
USGS MINERAL RESOURCES DATABASE
Thal I him iT11 _ r'_ 14nri-inn
0 125 250 500 MILES
F)l
THALLIUM DISTRIBUTION IN SOIL
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
10-5

_ j•��,�.�'t •�_r - ,f _ �•^ ,+�,•ya r�•�T- t - R^ I t _
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LEGEND:
-- DUKE ENERGY PROPERTY BOUNDARY
;T;: �} . ASH BASIN COMPLIANCE BOUNDARY
< � ,���,,,. , ..... ,. • : 1 .a}' � l�> ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH OR CINDER STORAGEAREA BOUNDARY
^
STREAM
• • , <; y� ---------- TOPOGRAPHIC CONTOUR rrFOO
_s }� •,� - �. �` EXISTING ASH BASIN VO L U NTARY G ROU N DWATER
MONITORING WELL
.S. :. .,'.r, .�... ':" yr•.1f `rt 4T �,,.a -..;. i1.. �' F �� �:r` :�" .1; ` r �' rk
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.r: MONITORING WELL
A
•,
•
�J
GROUNDWATER MONITORING WELL LOCATION
_ w.
- _
IL
i; 4 r?T, Y p. fi ,;k • c
OBSERVATION WELL LOCATION
, ... / "a_.i' -"..._ >,. 1 -- f '\ �,( +.r•!r 9.ri �d.�r' y.r j._i^. •.A. r �� C ■ '4 ,K,S, �.;$t'`}b '9rP »3t y�4'+kW:"Y!lRgr - _ R+ q, � Y � .,s,+n.•.
♦ k
'
'
w
d yx f SEEP SAMPLE LOCATION
r
Ilk
•� f
SURFACE WATER SAMPLE LOCATION
40
AVIN
-
1
Js ... >, c- ..=, "•"i ,i--', ,: `"auk_ _ a._ .°.;. :�'x.. .' P
y •I
>,�>1�•,�\ .'-....
NOTES:
1. PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL ESTATE AND IS APPROXIMATE.
2. ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE.
3. AS -BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY.
4. SHALLOW MONITORING WELLS (S) -WELL SCREEN INSTALLED ACROSS THE SURFICIAL WATER TABLE.
5. SHALLOW LOWER MONITORING WELLS I(SL) - BOTTOM OF WELL SCREEN SETATTHEASH-REGOLITH INTERFACE.
6. INTERMEDIATE MONITORING WELLS (1) - WELL SCREEN INSTALLEDIN REGOLITH BELOW WATERTABLEAND BELOWASH IN ASH BASIN.
7. DEEP MONITORING WELLS (D) - WELL SCREEN INSTALLED IN THE TRANSITION ZONE BETWEEN COMPETENT BEDROCK AND THE REGOLITH.
S. BEDROCK UPPER MONITORING WELLS (BRU) - WELL SCREEN INSTALLED IN COMPETENT BEDROCK IN THE FIRST15 FEETWHERE NOTRANSITION ZONE EXISTS.
9. BEDROCK MONITORING WELL (BR) - WELL SCREEN INSTALLED IN ROCK FRACTURE ZONE WITHIN COMPETENT BEDROCK.
10. TOPOGRAPHY DATA FOR THE SITE WAS OBTAINED FROM NC DOT GEOGRAPHIC INFORMATION SYSTEM (GIS) WEB SITE.
11.ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP(DATEDAPRIL2014).
12. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L.0107 (a).
13. SEEP SAMPLING LOCATIONS WERE OBTAINED BY HDR USING A TRIMBLE HANDHELD GPS UNIT ON APRIL 29,2014.
14. HYDROGRAPHY WAS OBTAINED FROM USGS 7.5-MINUTE SERIES TOPOGRAPHIC MAPS MOUNTAIN ISLAND LAKE, NC.
* INDICATES SEEP SAMPLING LOCATIONS WERE NOT RECORDED WITH GPS UNIT AND ARE APPROXIMATE.
SCALE (FEET)
/50, 0 /50' 300'
l'x = 300'
MONITORING WELL AND SAMPLE LOCATIONS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTO N COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
•

PROTECTIVE WELL
WITH LACKING
(2-FT MIN. F
FLUSH -MOUNT STEEL
WELL MANHOLE COVER
LOCKABLE WELL PLUG -
,DIE
CONCRETE WELL PAD
STING GROUND
UEEL MANHOLE SKIRT
PORTLAND CEMENT AND
BENTONITE MIX
(2-INCH DIA. SCH. 40 PVC)
B-INCH DIA. BOREHOLE
.(FOR DEEP AND BEDROCK
WELLS
OUTER CASING (6-INCH DIA.
SCH. 40 PVC FOR DEEP AND
BEDROCK WELLS)
TYPICAL FLUSH —MOUNT WELL COVER
SCALE: NTS
PLUG
CONCRETE WELL PAD
STING GROUND
GROUT SEAL TO SURFACE
WELL CASING
(2-INCH DIA. SCH. 40 PVC)
BENTONITE SEAL
TOP OF SCREEN
FILTER SAND
2-INCH DIA. SCH. 40 PVC SCREEN
(0.010-INCH SLOT) WITH PRE -PACKED
FILTER SAND
THREADED PVC CAP
TYPICAL SHALLOW MONITORING WELL (Single Cased)
SCALE. NTS
iD
E BOLLARD FILLED WITH
AND PAINTED YELLOW
TYPICAL PROTECTIVE BOLLARDS
SCALE: NTS
CREEN
E-PACKED
TYPICAL DEEP MONITORING WELL (Double Cased)
SCALE: NTS
NOTES:
1. MONITORING WELLS WILL BE CONSTRUCTED IN ACCORDANCE WITH 15A NCAC 02C .0108 STANDARDS OF CONSTRUCTION: WELLS OTHER THAN
WATER SUPPLY.
2. PROTECTIVE COVERS TO BE PAINTED BRIGHT YELLOW WITH WEATHER RESISTANT PAINT.
3. WELL TAG IDS TO BE ATTACHED TO WELL PROTECTIVE COVER WITH MECHANICAL RIVETS OR SET INSIDE FLUSH -MOUNT WELL COVER.
4. PROTECTIVE BOLLARDS (CONE -TAPERED, FILLED WITH CONCRETE, AND PAINTED YELLOW) ARE TO BE INSTALLED AS NECESSARY FOR WELLS LOCATED
IN AREAS WITH NEARBY VEHICULAR TRAFFIC.
S. SLOPE 2' X 2' CONCRETE PAD SURFACE UPWARD TO PROTECTIVE COVER TO PREVENT PONDING WATER.
6. WELL ID TO BE ETCHED IN 2' X 2' CONCRETE PAD.
7. ALL CONSTRUCTION MEASUREMENTS ARE APPROXIMATE.
F)l
PROTECT
WITH
(2-1
IETE WELL PAD
GROUND
f0 SURFACE
SCH. 40 PVC)
30REHOLE
(6-INCH DIAL
SET APPROX.
COMPETENT BEDROCK
;CH. 40 PVC SCREEN
SLOT) WITH PRE -PACKED
: CAP
4ENT AND BENTONITE
REQUIRED
)RING
TYPICAL BEDROCK MONITORING WELL (Double Cased)
SCALE NTS
WELL CONSTRUCTION DETAILS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
August 2015
FIGURE
10-9

100
10
A
6.25
9.17
8.8
5.66
4.39
3.02
4.65
\
3.19
2.76 2.84
1.8
14
2L Standard: 10 ug/1
1.34
128
Hg/L 10
1 NTU
0.81
0.8
5 5
5
• 5 5 5
a .
5
5
.
5
1
0
Oct-10 Feb-11 Jun-11 Oct-11
Feb-12
Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14
Jun-14 Oct-14 Feb-15 Jun-15
Chromium ■ Chromium, diss (ug/I) -1—Turbidity, field (NTU)
MW-7SR DATE
Chromiumand Turbidity AUGUST 2015
DUKEDUKE ENERGY
ERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-10
GASTON COUNTY. NORTH CAROLINA

10000
1000
1710
1420
921
1000
182 634
509
100
♦ 310 2 L Sta n da rd : 300 µS/ L 295 .
84.1
291
v147220
29.7 /`�\Ng/L100
NTU
79 21.7
72
♦
10.7 8.19 15
10
■
10
6.92
4.32
5.81 ��
1
1
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
+Iron, total (ug/1) ■ Iron, diss (ug/1) —Turbidity, field (NTU)
MW-10 DATE
Iron and Turbidity
AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-11
GASTON COUNTY, NORTH CAROLINA

1000 100
486
2L Standard= 300 µg/L
138
100
87 63 67
4
6
39
µg/L
A 38
�■
10 NTU
11 33
3
■
20
5.44
5.07
6.13
10
/
_
v
3.44 /3,13 .
2.41 2•48
-�
- 2.05 -
1
1
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
+Iron, total (ug/1) ■ Iron, disc (ug/1) Turbidity, field (NTU)
MW-11SR DATE
Iron and Turbidity
AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-12
GASTON COUNTY, NORTH CAROLINA

119/L
100000
10000
1000
100
10
1
Oct-10
37700
30300
23000
24200
24100
19000
20600 19300
20900
69 100
18300
19200
21100
/325010
21000
13500
7690
18.8
18.3
9.32
13.7
2LStandard: 3UU µWL
7.67
7.78
6.4
4.67
5.26
��
3.26
3.15 2,4
2.44
100
10 NTU
1
Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
+Iron, total (ug/1) ❑ Iron, diss (ug/1) f Turbidity, Feld (NTU)
MW-13 DATE
Iron and Turbidity
AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-13
GASTON COUNTY, NORTH CAROLINA

Ng/L
1000
686
. 935
/ 371 374 / 660
175 \25.6
100
\ 58
14.4 A
\/ 12.9
6.09
10
206
98 /
104 2L Standard: 3W
4.31
\♦-2.04
1.85
8.64
8.21
13
■
5.48
100
10 NTU
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
--*--iron, total (ug/1) ❑ Iron, diss (ug/1) Turbidity, field (NTU)
MW-14 DATE
Iron and Turbidity
AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-14
GASTON COUNTY, NORTH CAROLINA

µg/L
1000
100
10
1
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
Iron, total (ug/1) ❑ Iron, dins (ug/1) Turbidity, field (NTU)
100
10 NTU
1
MW-15 DATE
Iron and Turbidity
AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-15
GASTON COUNTY, NORTH CAROLINA

1000
0
30
'A 8.8
9.17
495 532 520
5.66 558
6.25 4.65
2LStandard: 3UU µgJL 445
221
4.39 285 3.19
158 166
155
W2.184
2.76
3.02
1172
�
154
100
1.8 119 110
1.34
1.28
Ng/L
1 NTU
0.81
10
1 0
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
+Iron, total (ug/1) ■ Iron, diss (ug/1) f Turbidity, Feld (NTU)
MW-7SR DATE
Iron and Turbidity
AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-16
GASTON COUNTY, NORTH CAROLINA

10000
1000
4160
2640
2750
2050
1680
1480 11111h
Z
1330
1320
2410
954
7721
1000
217
1120
948 110
777
93.7
658
�
100
100
76
44
2L
72.4
60
-
µg/L 100
NTU
■
25
27.4
■
10
10
1
1
Oct-10 Feb-11 Jun-11
Oct-11 Feb-12 Jun-12 Oct-12
Feb-13 Jun-13 Oct-13 Feb-14
Jun-14 Oct-14 Feb-15 Jun-15
+Iron, total (ug/I)
■ Iron, dins (ug/1) —Turbidity, field (NTU)
MW-8D DATE
Iron and Turbidity
AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-17
GASTON COUNTY, NORTH CAROLINA

10000
100
2460
2510
♦
2100
38.7
37.2
51.6
w
32.2
43.2
1000
812
1410
643
618
593 618
629
942 976
497
.
853
2L Standard: 300 WJL 23
20.8
20.4
436
19.8
♦
17.7,
18.2
14.1 10.8
100
10
Ng/L
NTU
44
■
10
1
1
Oct-10 Feb-11
Jun-11
Oct-11 Feb-12 Jun-12 Oct-12
Feb-13 Jun-13 Oct-13 Feb-14
Jun-14 Oct-14
Feb-15
Jun-15
+Iron, total (ug/1)
■ Iron, diss (ug/1) f Turbidity, Feld (NTU)
MW-8I DATE
Iron and Turbidity
AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-18
GASTON COUNTY, NORTH CAROLINA

10000
1000
T
1870 1950
1130
A
A
1000
'V
1060
569
139
\'�'
100
464
2L Standard: 3fl4 µg/L 263
381 209
49.7 341
272
37
A A
Ng/L 100
NTU
21.2
29.5
•`
18.6
14.3 14.4 19
12.6
■
10
13 10.3
■
10
5.82
1
1
Oct-10
Feb-11
Jun-11 Oct-11
Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14
Feb-15 Jun-15
Iron, total (ug/1) ❑ Iron, diss (ug/1) Turbidity, field (NTU)
MW-9 DATE
Iron and Turbidity
AUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-19
GASTON COUNTY, NORTH CAROLINA

4A9/L
1000
100
10
Oct-30 Feb-11 Jun-11 Oct-11 Feb-12
Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
Manganese, tot (ug/1) ❑ Manganese, diss (ug/1) Turbidity, field (NTU)
MW-10 DATE
Manganese and Turbidity AUGUST 2015
CAR
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-20
GASTON COUNTY, NORTH CAROLINA
1000
100
NTU
30
1

1000
100
384
100
59
2L Standard: 50 µg/L
NTU
Ng/L
10
11 24
30
17
14
1� 5.44
16
6.13 12 10
10
12 8
XI-5.07 9
7
3.44 2.72 / 3.53
3.34 \ 2.41
2.05
2.35 2.55
1.37
1
1
Oct-10
Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tManganese, tot (ug/1) ❑ Manganese, dins (ug/1) Turbidity, field (NTU)
MW-11SR DATE
Manganese and Turbidity AUGUST 2015
CAR
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-21
GASTON COUNTY, NORTH CAROLINA

100000
100
_
10300
10400
10000
10100
10500
10000
9330
10000
10500 8070
8760
10400
10300
10300
10300
10100
f
•
1000
18.8
18.3
13.7
NTU
µg/L
10
7.67
/
9.32
If
100
4
4.67
5.26
•
V
♦ 2L Standard: 50 µdL
•
3.75
-
3.15 2.4
2.44
10
♦
—•
1
1
Oct-10 Feb-11 Jun-11
Oct-11 Feb-12 Jun-12 Oct-12
Feb-13 Jun-13 Oct-13
Feb-14
Jun-14 Oct-14
Feb-15 Jun-15
Manganese, tot (ug/I)
❑ Manganese, dins (ug/I) Turbidity, field (NTU)
MW-13 DATE
Manganese and Turbidity AUGUST 2015
CAR
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-22
GASTON COUNTY, NORTH CAROLINA

Hg/L
1000
100
10
1
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
Manganese, tot (ug/1) ❑ Manganese, dins (ug/1) Turbidity, field (NTU)
MW-14 DATE
Manganese and Turbidity AUGUST 2015
CAR
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-23
GASTON COUNTY, NORTH CAROLINA
100
NTU
10
1

100
100
86
64 81
■ 58 ■
52
2L Standard: 50 Ng/L qg 50
45
46 49 41 ■ ■
41
- •`♦ ♦
NTU
10
µg/L
Loa10.9
10
6.02
16 ♦ 4 3.35
3.83
♦ 2.48 2.59
2.73
1
2.15 .77
1.5
1
1
Oct-10
Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
f Manganese, tot (ug/1) ❑ Manganese, diss (ug/l) Turbidity, field (NTU)
MW-15 DATE
Manganese and Turbidity AUGUST 2015
CAR
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-24
GASTON COUNTY, NORTH CAROLINA

1000
8.8
10
i
9.17
6.25
413
5.66
4.39
4.65
256
304
3.19
167
113
2.94
3.02
2.76
122
100
67
68
1.34
1.8
54
43 38
33
NTU
1.28
49
' 41
1
2LSWndard: 50 Ng/L
31
0.8
0.81
10
1
0
Oct-10
Feb-11 Jun-11
Oct-11 Feb-12
Jun-12 Oct-12
Feb-13 Jun-13
Oct-13 Feb-14
Jun-14 Oct-14 Feb-15 Jun-15
Manganese, tot (ug/1)
❑ Manganese, diss (ug/1)
Turbidity, field (NTU)
MW-7SR DATE
Manganese and Turbidity AUGUST 2015
CAR
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-25
GASTON COUNTY, NORTH CAROLINA

Rg/L
1000
100
10
1
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
— - Manganese, tot (ug/1) ❑ Manganese, diss (ug/1) Turbidity, field (NTU)
MW-8D DATE
Manganese and Turbidity AUGUST 2015
CAR
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-26
GASTON COUNTY, NORTH CAROLINA
1000
100
NTU
10
1

1000
100
538
290
43.2
168
38.7
A 37.2
x
32.2
32.2
/
93
100
17.7
18.2
23
20.4 52
19.8
2L Standard: 50 Vg/L
39
10.8
32 23
14.1
9.87
NTU
43
47
44
10
24
15
10
❑
❑
5
5
1
1
Oct -SO
Feb-11 Jun-11 OM-11
Feb-12 Jun-12 OM-12
Feb-13 Jun-13
Oct-13 Feb-14
Jun-14 Oct-14
Feb-15 Jun-15
--*--Manganese, tot (ug(1)
❑ Manganese, diss (ug/1)
Turbidity, field (NTU)
1I DATE
Manganese and Turbidity AUGUST 2015
CAR
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-27
GASTON COUNTY, NORTH CAROLINA

1000
1000
100
100
68
62
■
2L Standard: 50 Ng/L
49.7
A
Itg/L
25 25 37
NTU
20
19
21.2
18i
14.3 14.4
10
10
12.6
10
10.3
7
7
■
5.82 5
•
5.07
4.79
4.28
1
1
Oct-10
Feb-11
Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13
Oct-13 Feb-14
Jun-14
Oct-14 Feb-15
Jun-15
Manganese, tot (ug/1) ❑ Manganese, dins (ug/1)
Turbidity, field (NTU)
II DATE
Manganese and Turbidity AUGUST 2015
CAR
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-28
GASTON COUNTY, NORTH CAROLINA

10
1000
182
84.1
100
2L Standard: 6.5 - B.SSU
7
5.4 S.3 5.36 S.3 5.26 5.41 5.29
NTU
SU
4.8
29.7
30
30.7
• 8.19 7Z
6.92 -
- 5.81
• 5.08
4.32 4.2j
3.19
0 1
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-1S May-1S
+pH (field) —Turbidity, field
MW-10 DATE
pH and TurbidityAUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-29
GASTON COUNTY, NORTH CAROLINA

10
10
■
2L Standard: 6.5 - B.SSU
2.6
2.24 2.24
1.94
1.77
1.66
5.83
1.55
5 87
5.63
5.67 5.66
5.75 5.67 5.64 5.76 5.65
5.55
5
5.68
0.94 1.24
1 NTU
SU
.
0.68
x
0.64
'A
0.18
0
0
Sep-10 Jan-11 May-11
Sep-11
Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
Sep-14 Jan-15 May-15
tpH (field) —Turbidity, field
MW-11 DR DATE
pH and TurbidityAUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-30
GASTON COUNTY, NORTH CAROLINA

10
8
6
4
z
6.07
5.79 5.72 5.72 5.78 5.72 3.77 5.68 5.76
3.39
11
5.73 5.68
5.62
2L Standard; 6.5 - 8.5SU
6,13
5
5.07 .44
3.44 3.53
3.34
Y
2.72
2.55 -
2.41
2.05
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
+pH (field) —Turbidity, field
MWAISR
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST 2015
FIGURE
10-31
100
10 NTU
1

10
8
6
SU
4
2
6.27 28 6.13 18.8 18.3
6.35 6.29 6.
6.22 6.18
5.99 5.97 5.86
5.8
6.17 6.13
5.97 7
13.7
oe-
2L Standard; 6.5 - 8.5SU
9.32
7.67 7.7FA
6.4
5.26
4.67
3.75
v
3.1j�
■ 2.44
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
+pH (field) —*--Turbidity, field
MW-13
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST 2015
FIGURE
10-32
100
10 NTU
1

10
8
6
SU
4
2
- �6 519 2LStandard: 6.5-§S�kl 5.2 5.19
5.07 5.1 5.06 5.05 5.11
- 10.9
7.99 6.02
3.83
s♦
4.16 ♦
\,Z
3.35
2.73 ♦
♦ 2.48
2.15
1.77
1.5
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12
Jan-13 May-13 Sep-13 Jan-14 May-14
pH (field) Turbidity, field
MW-15
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST 2015
FIGURE
10-33
100
10 NTU
1

10
8
6
SU
4
2
A
4.73
A 3.25
3.04
3
2.05
2L Standard: 6.5 - 8.SSU
5.79 5.8
5.68 5.68 5.69
5.61 5.56 5.51 5.5 5.62 5 48 5.61 5.56
1.48
1.2
�a A
0.89
0.59
0.42
0.44
0.29
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
+pH (field) —Turbidity, field
II
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST 2015
FIGURE
10-34
10
1 NTU
0

10
8
6
SU
4
2
8.8
/6,11
4.39
3
2.76 .02
Y
2.84
1.8 2L Standard: 6.5-8.SSU
128 1.34
5.33 5.34 5.37
5.29
5.13 5'19 4.96 5.06 5.05 ■
■
5.24
5.12
0.8
0.81
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
pH (field) Turbidity, field
MW-7SR
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST 2015
FIGURE
10-35
10
1 NTU
0

10
8
6
4
2
217
.84_ • 6.77 6.81 100 110 93.7
6.27 6.31 6.34 6.34
76 6.49 6.41 6.38 6.34 72.4
44
41.4
h
36 32.6
25 -
24.7
■
2L Standard: 6.5 - S.SSU
0
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
tpH(field)—d�Turbidity,field
MW-8D
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST 2015
FIGURE
10-36
1000
100
NTU
10
1

30
8
6
SU
4
2
37.2 38.7
32.2 32.2
23
20.4 19.8 20.8
6.82 17.7 18.2
6.4 6.33 6.4 6.4 6.38
14.1
6.09 6.05 6 6.03 5.98 6.02 6.01 5.97
5.65
9 87 10.8
2L Standard: 6.5 - 8.5SU
0
Sep-30
Jan-11 May-11 Sep-11 Jan-12 May-12
Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14
tpH(field)—r�Turbidity,field
MW-81
pH and Turbidity
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Sep-14 Jan-15 May-15
DATE
AUGUST 2015
FIGURE
10-37
100
10 NTU
1

10 100
8
18
16
6
13.2 Or
r
10.7
9.98 2LStarh&d:6.5-8.55U 4.8 4.78 4.82
5.33 5.22 5.22111
10 NTU
5U
5.08 5.07
-01
4.94 7.89 4.92
4.71 '0019.46
4
4.34
7.65 ♦ 7.07 7.42
6.76
Z6.12
4.18
2.77 2.72
Y
2
0
1
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
pH (field) Turbidity, field
MW-8S DATE
pH and TurbidityAUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-38
GASTON COUNTY, NORTH CAROLINA

10
1000
8
139
2L Standard: 6.5 - 8.SSU
100
6.1
5.98 6 6.02
6.4
6.29
5.99
6
6.14
6.13
6.23
6.03
6.01 5 97 6.05
A
37 5.82
SU
-
Z49.7
NTU
18.6
4
ZA
12.6
14.3
14.4
30
10.3
2
5.82
4.79 5.07
4.28
0
1
Sep-10
Jan-11
May-11 Sep-11 Jan-12 May-12 Sep-12
Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
pH (field) Turbidity, field
MW-9 DATE
pH and TurbidityAUGUST 2015
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-39
GASTON COUNTY, NORTH CAROLINA

10
µg/L 1
0
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
Antimony, tot (ug/1) ❑ Antimony, diss (ug/1) Turbidity, field (NTU)
10
NTU
1
0
II DATE
Antimand TurbidityAUGUST 2015
DUKE E
DUKE ENERGY CARAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-40
GASTON COUNTY, NORTH CAROLINA

100
10
pg/L
1
Sep-10
Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13
MW-71)(86) MW-81) MW-81 MW-11DR
2L Standard: 10 ugA
6
Jan-14 May-14 Sep-14 Jan-15 May-15
MW-7D vs Deep Wells DATE
HPChromium (tot) AUGUST 2015
Duke Carolinas, LLC
RIverbend Steam Station Ash Basin FIGURE
10-41
Gaston County, NORTH CAROLINA

100
■
10
4�L
2L Standard10 ug/I
1
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—BMW-7SR(BG) BMW-10 BMW-11SR mil(—MW-13 MW-14 BMW-15 BMW-8S BMW-9
MW-7SR vs Shallow Wells DATE
Chromium (tot) AUGUST 2015
Duke Carolinas, LLC
Rlverbend Steam Station Ash Basin FIGURE
10-42
Gaston County, NORTH CAROLINA

10000
1000
•
2L Standard: 300 WJL
100
pg/L
■
■
A
20
■
■
■
■
■
■
■
■ ■
■
■
■
10
10 10
■
■
■
■
■
■ ■
■
■
■
1
Sep-10 Jan-11
May-11
Sep-11
Jan-12
May-12
Sep-12
Jan-13
May-13 Sep-13
Jan-14
May-14
Sep-14 Jan-15
May-15
—BMW-7D (BG)
tMW-8D
MW-81—MW-11DR
MW-713 vs Deep Wells DATE
K)�
Iron (tot) AUGUST 2015
Duke Carolinas, LLC
Rlverbend Steam Station Ash Basin FIGURE
10-43
Gaston County, NORTH CAROLINA

100000
10000
1000
41B/L
100
10
1
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
MW-7SR(BG) BMW-8S BMW-9 — —MW-10 MW-11SR MW-13 MW-14 MW-15
MW-7SR vs Shallow Wells DATE
HPIron (tot) AUGUST 2015
Duke Carolinas, LLC
Rlverbend Steam Station Ash Basin FIGURE
10-44
Gaston County, NORTH CAROLINA

1000
100ff"
. Mae
■
■
■
2L Standard: 50 Ng/L
■
pg/L
10
.
i
♦
�
�
\
5 .
.
5
5 5
5
5
5 5
5
5
5 5 5
1
Sep-10
Jan-11 May-11
Sep-11
Jan-12 May-12
Sep-12
Jan-13
May-13 Sep-13
Jan-14
May-14
Sep-14 Jan-15 May-15
MW-71)(13G)
MW-81)
MW-81 MW-11DR
MW-7D vs Deep Wells DATE
Manganese (tot) AUGUST 2015
Duke C
Duke Carolinas,, LLC
RIverbend Steam Station Ash Basin FIGURE
10-45
Gaston County, NORTH CAROLINA

100000
10000
1000
384
242
70
us/L
r
100
2L Standard: 50 peL
10
10000 10300 10300 10300 10500 10100 10300 10000 10100 9330
8070 'i-v%00
205 — 185 .
1 i i i
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—*—MW-11SR MW-7SR(BG) - MW-8S MW-9 MW-10 MW-13 MW-14 BMW-15
MW-7SSR vs Deep Wells GATE
Manganese (tot) AUGUST 2015
Duke C
Duke Carolinas,, LLC
RIverbend Steam Station Ash Basin FIGURE
10-46
Gaston County, NORTH CAROLINA

9
9
2L Standard: 6.5 - 8.5 SU
8
8
7
7
SU
6
�IC
5
5
4
Sep-30 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
MW-7D(BG) tMW-8D 1 MW-81 MW-11DR
MW-7D vs Deep Wells DATE
KR pH, field AUGUST 2015
Duke Carolinas, LLC
RIverbend Steam Station Ash Basin FIGURE
10-47
Gaston County, NORTH CAROLINA

9
8
2L Standard: 6.5 - 8.5 SU
7
6.95
6.86 6.79 6.8 6.81 6.85
6.71 6.73 6•79 6.74 6.73 6.76
6.63 6.64 6.64
6
5
--
SU
4
3
2
1
Sep -SO Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—BMW-7SR(BG) BMW-8S BMW-9 CIE—MW-10 MW-11SR MW-13 BMW-14 BMW-15
MW-7SR vs Shallow Wells DATE
pH, field AUGUST 2015
Duke Carolinas, LLC
Rhrerbend Steam Station Ash Basin FIGURE
10-48
Gaston County, NORTH CAROLINA

10
1
pg/L
0
2L Standard: I ug/1
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—BMW-7D (BG) --III - MW-81 MW-11DR
MW-7D vs DeepWells DATE
Antimony (tot) AUGUST 2015
Duke Carolinas, LLC
RIverbend Steam Station Ash Basin FIGURE
10-49
Gaston County, NORTH CAROLINA

10
1
0
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—BMW-7SR(BG) BMW-10 BMW-11SR CIE—MW-13 BMW-14 4--MW-15 BMW-8S BMW-9
MW-7SR vs Shallow Wells DATE
Antimony (tot) AUGUST 2015
Duke Carolinas, LLC
RIverbend Steam Station Ash Basin FIGURE
10-50
Gaston County, NORTH CAROLINA

10
2L Standard: lugA
ug/I 1 ;
0
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 0ct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tMW-10 fMW-11DR —BMW-11SR-(—MW-13-l(—MW-14 tMW-15 +MW-8D BMW-81 —MW-8S tMW-9
Stacked Time Series Plots - Compliance Wells DATE
F)"'Z Antimony
AUGUST 2015
Duke Energy Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-51
Gaston County, NORTH CAROLINA

r
w
Y�
Stacked Time Series Plots -Compliance Wells DATE
Iron AUGUST 2015
Duke Energy Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-52
Gaston County, NORTH CAROLINA

100,000
- - -
0,000
000
10
D• :D
Stacked Time Series Plots - Compliance Wells DATE
Manganese AUGUST 2015
Duke Energy Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-53
Gaston County, NORTH CAROLINA

10
2L Standard: 10 Usti
ug/I
1
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tMW-10 fMW-11DR —BMW-11SR —FMW-13 —IFMW-14 tMW-15 — MW-81) MW-81 —MW-85 tMW-9
Stacked Time Series Plots - Compliance Wells PATE
Chromium AUGUST 2015
Duke Energy Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-54
Gaston County, NORTH CAROLINA

9
8
2L Standard: 6.5 - 9.5 SU
2
6
5
SUI 4
3
2
1
0
Oct-10 Feb-11 Jun-11 Oct-11 Feb-12 Jun-12 Oct-12 Feb-13 Jun-13 Oct-13 Feb-14 Jun-14 Oct-14 Feb-15 Jun-15
tMW-10 tMW-11DR —BMW-11SR --/FMW-13 --11FMW-14 tMW-15 +MW-81) BMW-SI BMW-8S tMW-9 —Seriesl—Series2
Stacked Time Series Plots - Compliance Wells DATE
pH AUGUST2015
Duke Energy Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-55
Gaston County, NORTH CAROLINA

1000
Ratios > 1 signify concentration greater than concentration in background well.
-
6.753
100
109.032
7.719
-
78.7
85.3
81i j
61.8
61.8
43.190
. 8.722 36.923
4.051
19.520
17.281
10
2.342
2L Standard: 300 WJL
0
6.561
7.290
C
4. 32
976
21
3. 1
/2.171
2.903
34g2.141
2.3941.905
1.4■
■
■ .584
c
e 1
.'
.872
0.90
0
0.733
.658
0.661
.542
52
g -
.424
287
.443
.354 0.3
7
0.317
249
0.258
.204
0.197
0.147
3
-
0.127
0
0.076
0.052
-
.046
0.030
0
Sep-10
Jan-11
May-11 Sep-11 Jan-12 May-12 Sep-12
Jan-13 May-13
Sep-13 Jan-14 May-14
Sep-14 Jan -IS May-15
-BMW-81/MW-70
tMW-110R/MW-7D tMW-10/MW-7SR --)It-MW-11SR/MW-75R
-4 MW-13/MW-75R
MW-14/MW-7SR BMW-15/MW-75R -
MW-8S/MW-7SR tMW-9/MW-75R
Correlation Plot - Compliance Wells vs. Background DATE
Iron (tot) AUGUST 2015
Duke Carolinas, LLC
Rlverbend Steam Station Ash Basin FIGURE
10-56
Gaston County, NORTH CAROLINA

1000
Ratios > 1 signify concentration greater than concentration in background well.
303.0303 325.8065
244.1 265.7895
257.5000
233.2500
153.7313
162.2222
118.6765
100
107.6
91.1504 84.4262
�
9.8802
42
34.2105
•
� 20.2 18.� 33.
-
0
'
18.6
a
10.2
e
J? 10
8.6
■
8.8
■
5.606
•
4.6
■
581
3.1239
3.4E
00
.
2.4444
2.1257
1. 59
-
5
1
1.15
842 12�
.1250
193
0.9298
52
4k .7734
0.7611
.686
0.6852
0. 60
0.5526
.48
0.4750
_
0.4186
.2985
•3
0.3226
36 2124
_
6
0.1414 0.1393
0.1481
0
Sep-30
Jan-11
May-11 Sep-11 Jan-12 May-12 Sep-12
Jan-13
May-13 Sep-13 Jan-14 May-14
Sep-14 Jan-15
May-15
-BMW-81/MW-7D
BMW-11DR/MW-7D BMW-8S/MW-7SR-IfMW-9/MW-7SR
MW-10/MW-7SR MW-11SR/MW-7SR
MW-13/MW-7SR
MW-14/MW-7SR
MW-15/MW-7SR
Correlation Plot - Compliance Well vs. Background DATE
ERManganese (tot, AUGUST 2015
Duke Carolinas, LLC
Rhrerbend Steam Station Ash Basin FIGURE
10-57
Gaston County, NORTH CAROLINA

10
Ratios > 1 signify concentration greater than concentration in background well.
0
a
c
0
c
g 1
0
u
C
e
C
0
u
0
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—>ir-MW-81/MW-7D BMW-11DR/MW-7D tMW-10/MW-7SR-I(—MW-11SR/MW-7SR f MW-13/MW-7SR MW-14/MW-7SR MW-15/MW_75R MW-8S/MW-7SR 0--MW-9/MW-7SR
Correlation Plot - Compliance Well vs. Background DATE
Chromium (tot) AUGUST 2015
Duke Carolinas, LLC
Rhrerbend Steam Station Ash Basin FIGURE
10-58
Gaston County, NORTH CAROLINA

1.6
1.4
1.2
1.0
0 0.8
0.2
0.0
Sep-30 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
MW-81/MW-7D tMW-11DR/MW-7D MW-10/MW-7SR—MW-11SR/MW-7SR MW-14/MW-7SR MW-15/MW-7SR MW-8S/MW-7SR MW-9/MW7SR
Correlation Plot - Compliance Well vs. Background DATE
ERpH (field) AUGUST 2015
Duke Carolinas, LLC
Riverbend Steam Station Ash Basin FIGURE
10-59
Gaston County, NORTH CAROLINA

10
Ratios > 1 signify concentration greater than concentration in background well.
0
C
0
e
m
c
0
u
1
c
0
u
0
Sep-10 Jan-11 May-11 Sep-11 Jan-12 May-12 Sep-12 Jan-13 May-13 Sep-13 Jan-14 May-14 Sep-14 Jan-15 May-15
—BMW-81/MW-7D tMW-11DR/MW-7D BMW-10/MW-7SR—M—MW-115R/MW-7SR —0 MW-13/MW-7SR MW-14/MW-75R - MW-15/MW-7SR BMW-85/MW-75R tMW-9/MW-75R
Correlation Plot - Compliance Well vs. Background DATE
KP Antimony (tot) AUGUST 2015
Duke Carolinas, LLC
RIverbend Steam Station Ash Basin FIGURE
10-60
Gaston County, NORTH CAROLINA

Figure 10-61 through 10-117 Unused

TZ K )IT",
R _
y ` MW 15 MW-15D MW 15BR
L" Ana to L Ana to to L
IY (Ng/ IY (N9/L) Ana IY (Ng/ .
Cobalt 1.3 Vanadium 22.4 Vanadium 2.2
Vanadium 2.7
MW-3S MW-3113
Analyte (Ng/L) Analyte (Ng/L)
Manganese 68 Vanadium 6.2
Vanadium 0.6J+
G1NA-1S G1NA-111)
Analyte (Ng/L) Analyte (Ng/L
y Chromium 11.6 Antimony 3.2
Cobalt 2.1 Iron 720
Iron 1,800 Vanadium 21
Manganese 110
' v . ;• "' ,,�{ e+ `; , .,. Vanadium 7.9
r
4 t, 4 b - ; r'r-"` •l•, ;- *r..•i 'iys,` TAP '"� �"'�+'l.,.Ab _ '�"'� , ' � _ � �^ * j, ip`": � �' � - k, - +�1' - ..
IIIA
MW-11SR MW-11DR
Analyte (Ng/L) Analyte (Ng/L)
VanadiumF 1.4 Vanadium 2.1
AB-5S
AB-5SL AB-511)
AB-4S
AB-411)
Analyte (Ng/L)
Analyte (Ng/L) Analyte (Ng/L)
Analyte (Ng/L)
Analyte (Ng/L)
MW-211)
Antimony
21.6
Antimony
3.2 Antimonyl
1.2
Manganese 1,200 Antimony 1.2
Analyte (Ng/L)
Arsenic
651
Arsenic
75.1 Vanadiuml
12.5
MVanadiuml 24
Vanadium
4.7
a Boron
1,400
Boron
2,400 :-
_
f Iron
660
Vanadium 151
Thallium
0.48
q
4 Vanadium
231
`-
GWA-2S
GWA-2BR
GWA-2BRU
Analyte (Ng/L)
Analyte (Ng/L)
Analyte (Ng/L)
Iron
590 Vanadiuml
11.8
Antimony
18.2
AB-6S
AB-6BRU
95
Chromium
46
Analyte (Ng/L)
Analyte (Ng/L)
Sample 1
Sample 2
Manganese
87.2
Iron
1,500
Antimony
1.8
Antimony
*DNE
2.5
Vanadium
2.3
Manganese
61
Iron
730
Cobalt
*DNE
1.8
Total Dissolved Solids
18,100,000
Vanadium
25.2
Iron I
*DNEI
970
Vanadium
4- -'
Vanadium
11.9
18.6
MW-iS MW-iD
AB-8S AB-8113 Analyte (Ng/L) Analyte (Ng/L)
Analyte (Ng/L) Analyte (Ng/L) Cobaltj 61 Manganese 530
Manganesel 150 Manganese 140 Iron 30,800 Vanadium 2.1J+
Vanadium 0.79J Vanadium 2.7 Manganese 2,600
�k
MW-9 MW-9113 MW-9BR
Analyte (Ng/L) Analyte (Ng/L) Sample 1 Sample 2 Analyte (Ng/L)
[Vanadiuml 2.7 Antimony 5.4 2.7 timonyl 2.3
Chromium 20.6 27 Vanadium 7.8
Vanadium 12.51 12.8
c
G1NA-3SA G1NA-3113
Analyte (Ng/L) Analyte (Ng/L)
Cobalt 18.4 Cobalt 1.1
Iron 420 Manganese 9,200
Manganese 12,700 Sulfate 1,310,000
Sulfate 1,420,000 Total Dissolved Solids 2,390,000
Total Dissolved Solids 23,000,000 Vanadium 4.6
Vanadium 1.3
C- is
Analyte (Ng/L)
Arsenic 25.8
Cobalt 102
Iron 175,000
Manganese 3,200
Sulfate 559,000
Total Dissolved Solids 1,110,000
Vanadium 4 ►'
C-2S C-2D
Analyte (Ng/L) Anallyte (Ng/L)
Cobalt 39.7 Vanadium 10.9 7
Manganese 600
Vanadium 0.52J :�,4
MW-10
II (Ng/L)
Vanadiuml 1.2
�. � 3 .� �- � `, '•� � dam''14
,�•' . �, „� ,
5
r /
,
ri
Y
' AS-1S AS-iD
Analyte (Ng/L) Analyte (Ng/L)
Boron 2,200 Antimony 3
Cobalt 5.4 Chromium 903
o Iron 660 Vanadium 14.4
2
Manganese 1,900 r l
f Total Dissolved Solids 750,000J
Vanadium 1.6J+ s '' ' GWA-20S GWA-20D
.��
Ana to L Ana to L
/ /
w
,f
h/ (N9 ) h/ (N9 )
Chromium 133 Chromium 186
Cobalt 12.7 Cobalt 1.9
?1 Iron 9,500 Iron 660
G1NA-4S G1NA-4D Manganese 320 Sulfate 376,000J+
N
IY (Ng/) II (Ng/ g
:, Ana to L Ana to L Vanadium 23 Thallium 3.2
e
V
�� ;�Cobalt 1.7 Vanadium 2.4 , Total Dissolved Solids 2,900,000
,'° w
,! � ,'' Manganese 120 r ., Vanadium 2.1
ws ' ' .
Vanadium 0.84J •3 _, �- s
w -
r
40
GWA-10S GWA-10D
Analyte (Ng/L) Analyte (Ng/L)
Cobaltj 10 onyl 1.1
Manganese 250 Vanadium 6.8
Vanadium 0.62J „
MW-4D
Analyte (Ng/L)
Vanadium 1.1 "
IM
dr
M
►R
/ A
AS-3D
Analyte (Ng/L) G1NA-SS GWA-5113
Antimonyl 1.6 Analyte (Ng/L) Analyte (pg/L)
Chromiuml 23.5 Cobaltj 4.5 Chromium 24.5
Vanadium 18.2 Maneanesel 19ol vanad f uml 13.9
GWA-23S GWA-23BR
Analyte (Ng/L) Analyte (Ng/L) GWA-22S GALA-2211) GWA-22BR
Cobalt 3.3 Chromium 15.6 Analyte (Ng/L) Analyte (Ng/L) Analyte (pg/L)
Iron 530 Total Dissolved Solids 790,000 Antimony 2.2 Antimony 1.4 Chromium 108
Manganese 82 Vanadium 5.3 Cobalt 1.3 Chromium 174 Vanadium 4.33
Cobalt 3.4 ;
P Iron 2,600
AS-2 S AS-211) MW-8S MW-811) MW-8I 1manganese 120
Analyte (Ng/L) Anallyte (Ng/L) Analyte (Ng/L) AnaIII (Ng/L) Analyte (Ng/L) Vanadium 18.5 }'• _
Chromium 44.8 Chromium 22.5 Mangane el 57 Cobalt 1.1 Iro il 2,100
Cobalt 12.4 Vanadium 34.6 Vanadium 0.32J+ Iron 2,700 Vanadium 2.8.. ~
Iron 2,090 '
Vanadium 4.1
Manganese E
Vanadium 3.9
500 0 500 1, 000
SCALE (FEET)
Analyte (Ng/L)
Cobaltj 23.7
AB-1S
AB-iD
Iron 15,700
;Analyte (Ng/L)
Analyte (Ng/L)
Manganese 8,300
Antimony
3.2
Antimony 6.3
Cobalt
15.9 Chromium 49.2
Iron
510
Cobalt 2.9
Manganese
250
Iron 370
Vanadium
1.8
Vanadium 20
G1NA-9S G1NA-911) G AIA-9BR
Analyte (Ng/L) Anallyte (Ng/L) Analyte (Ng/L)
MW-5113 Cobaltj 50.1 Manganese 90 Antimony 4.5
nalyte (Ng/L) Manganesel 2,900 Vanadium 2.8 Arsenic 10.7
Vanadium 1 8.61111111 Vanadium 0.52J+ Chromium 40.6
Ironj 450
Vanadiuml 67.5
MW-6S I MW-6113
P►nalyte (Ng/L) Analyte (Ng/L)
Vanadium 10.35.1 Vanadium 3.$
AB-2S AB-2113
Analyte (Ng/L) nalyte (Ng/L)
Antimony 3.1 Chromium 13
Cobalt 17.1 Vanadium 32.4
Iron 1,700
Manganese 330
Vanadium 3.8
GWA-8S GINA-8113
MW-14 Analyte (Ng/L) Analyte (Ng/L)
Analyte (Ng/L) Manganese 720 Iron 1,300
Vanadium 2.6J+ Manganese 96
-ems.
G1NA-7S GINA-711) GWA-7BR
Analyte (Ng/L) Analyte (Ng/L) Analyte (Ng/L)
Iron 790 Iron 440 Vanadium 10.9
Vanadium 3.5J+ Vanadium 12.1
BG-3S BG-311)
Analyte (Ng/L) Analyte (Ng/L)
Antimony 1.3J+ Iron 930
Manganese 240 Manganese 63
Vanadium 0.75J+r Vanadium 3.7
N
Analyte
CA S
Nb.
NC 2L
Groundwater
IMA C1
Antimony
7440-36-0
1*
Arsenic
7440-38-2
10
Barium
7440-39-3
700
Beryllium
7440-41-7
4*
Boron
7440-42-8
700
Cadmium
7440-43-9
2
Chloride* *
16887-00-6
250,000
Chromium
7440-47-3
10
Cobalt
7440-48-4
1*
Copper* *
7440-50-8
11000
Iron
7439-89-6
300
Lead
7439-92-1
15
Manganese
7439-96-5
50
Mercury
7439-97-6
1
Nickel
7440-02-0
100
Nitrate* *
14797-55-8
10,000
Nitrite as N* *
14797-65-0
11000
Selenium
7782-49-2
20
Sulfate* *
14808-79-8
250,000
Thallium
7440-28-0
0.2
Total Dissolved Solids**
TDS
500,000
Vanadium
7440-62-2
0.3*
Zinc* *
7440-66-6
1000
* Interim Maximum Allowable Concentration (IMAC)
jilt S­
Unit reported in mg/L in standard, converted here to pg/Lto match
' units displayed on figure.
J ;~r ` 'f• 'A 5C, " :.a - All units shown in pg/L.
1 - North Carolina 15A NCAC 02L. 0202 Groundwater Standards (As of
x p� j •° F 4/2013). Interim Maximum Allowable Concentration shown where no
sta nda rd is ava ila ble for comps rison.
or
o ;i' �•
if
,;, r} ,� , • NOTES:
U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMIT
s J = ESTIMATED CONCENTRATION
"' f; _ "e • `3 •;• ,: <3.0 = LESS THAN THE LABORATORY REPORTING LIMIT
' J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
1R' A
gel
• I. , .L
{ *; <g
yN '� vlr an an an an
an
MW-7BR I- -
x, GINA-6S G1NA-611) Analyte (Ng/L)
Analyte (Ng/L) Analyte (Ng/L) t Chromium 24.7
Cobalt 27.6 Chromium 24.8 Total Dissolved Solids 1,180,000
\ Iron 1,1001 Vanadium 281. Vanadium 2.1
Manganese 1,300
4
f
Vanadium 4.8bNk
AB-7S AB-711) AB-7I
Analyte (Ng/L) Analyte (Ng/L) Analyte (Ng/L) AB- 3S AB-311) AB-3BR
Arsenic 24.3 Antimony 7.5 Cobalt 1.6 Analyte (Ng/L) Sample 1 Sample 2 Analyte (Ng/L) Analyte (Ng/L)
Cobalt 13.4 Chromium 24.7 Iron ir^ Antimony *DNE 1.7 Chromium 51 Cobalt 1.64
380
Iron 11,2001 Vanadium 40.5 Manganese 85 Arsenic 283 *DNE Total Dissolved Solids I 9AbIJUIJI Iron 4,440
Cobalt 1.9 *DNE Vanadium 11.5 Manganese 87
! =, Iron 6,500 990 Vanadium 32.1
Manganese 1,340 , Y•,,,
Vanadium 1.1 Manganese 910 730
Total Dissolved Solids *DNE 519,000
Vanadium 11.3 4.9
GROUNDWATER ANALYTICAL RESULTS - PLAN VIEW (2L EXCEEDANCES)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
pG/L: MICROGRAMS PER LITER
Y•
BG-2S BG-213 BG-2BR
Analyte (Ng/L) Analyte (Ng/L) Analyte (Ng/
Manganese 370 Chromium 57.5 Iron 7601 s
Vanadium 0.35J Vanadium 29.9 Vanadium 4.6
.r:.l LEGEND
4; ASH BASIN ASSESSMENT
GROUNDWATER MONITORING WELL
ASH BASIN COMPLIANCE
GROUNDWATER MONITORING WELL
ASH BASIN VOLUNTARY GROUNDWATER
�► .. - MONITORING WELL
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
` COINCIDENT WITH DUKE ENERGY
` PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
BG-1S` BG-1113 ASH STORAGE
�. t
to L Ana to (N9 ) IY (N9 )
Cobalt 3 Antimony 3.3
Iron 2,200 Chromium 32.3
-- DUKE ENERGY PROPERTY BOUNDARY
u Manganese 300 Cobalt 1.3
Vanadium 5.9 Iron 1,500
Total Dissolved Solids 555,000
Vanadium 22
DATE
AUGUST 2015
FIGURE
10-118

1
J
;
{ 3 a
Ar
to .Uf f Yz'41
• r
am
'i C 1. .' Ft 4 t'`a SE ..'..f� .H t � }�A'e`7ti3r'�25• ''d
• f �'f �. u i t� - ��i,'sit' C
Yf ay
va
MW--15
GWA-10S
MW-3Sr <0.5U (<0.5U)
h n Ow'
N 0.5UJ (0.5UJ)
' GWA-1 S
0.28J (0.22J)
M W-13
s:.. 0.5UJ (0.5UJ)
O
MW-11SR
'0.87(0.72)
.MW--5S
)
ijl& i
M W-6S
<0.5U (<0.5 d }.
AB-2S; ; GWA-9S
i 3.1 (3.4) 0.5UJ (0.5UJ)
-
<0.5U <0.5 WA 2 ,
<0.5U (<05U) r t, ,< 0.5UJ (0.5UJ)__t.
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- GWA-7S
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<0.5U (<0.5U)
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.77J+ (0.6J+) .., f, AB-8.
<0.5U'S
AB-71
1J+ (3.6)
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<0.5U (<0.5U)
GWA-5S
<0.5U (<0.5U)
0.6
BG-3S:"%
1.3J+ (1.4J+) ee-'
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0.33J (0.25J)
BG-1 S
0.43J (0.23J)
APPF
• ORTf
• THE
THE
ALL C
ANTIMONY ISOCONCENTRATION CONTOUR MAP — SHALLC
300 600
DUKE ENERGY CAROLINAS, LLC
.E (FEET) RIVERRFND STEAM STATION ASH BASIN

�'k
NO
2
V— U
&
MW-15D
074(074)
GWAA�OD
MW-3D 1.1 (<#C.5U)
4
GWA-1 D♦
00 MW-4D
***,3.2 (2.6 <0.5U (<0.5U)
IVI vv— I I um #
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ffr- I D M VV- 5 D
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0.5UJ (0.5UJ) --':�0.5U (<MU)
10
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ek
Air
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1 (0.85)
AB D
1.2(1.4
GWA-8D
•
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AB-3D
0 -22 J (<0.5U)
low
MW-1D
AB-5D
# 0.5UJ (0.5UJ)
1. 2 (0.5
o
GWA-7D
MW-9D
5.4 (16.8) 0.17J (<0.5U)
10*
10
GWA-3D * 4V
<0 5U (<0.5U)♦ AB-8D
Air
♦ 10
10
10
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<0.5U (<0.5U)
GWA-6D
0.25J (0.25J)
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L� 7
r
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<0.5U (<0.5U)
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•
GWA-29D
GWA-20<0.5U (<Au) GWA-22po
•
<0.5U (<0.5
GWA-4D D ml�' 4, 1.4 ( < at U)
<0.5U (0.17J) U) ✓
Is
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m
0.21J+ (0.5U
Ab &
Est,
V
BG-3D
0.16J (<0.5U)
Pr.-qn
BG-1jD
3.3(3.9.)
000
er
9 ewe
DUKE ENERGY CARC
:ZIVFRRFND STEAM -c-
L
MA 1[0
NAb, LI
5XIONA
01 LI I Kell] :41 M Fil � W a 0:
A
I

300 0 300 600
SCALE (FEET)
LEGEND:
Q� GROUNDWATER ASSESSMENT MONITORING WELL
IMAC CONTOUR
--- I NON DETECT CONTOUR N
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER IMAC FOR ANTIMONY IS 1 pg/L
NON DETECT CONTOUR CONCENTRATION IS 0.5 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
ANTIMONY ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-121
GASTON COUNTY, NORTH CAROLINA

300 0 300 600
SCALE (FEET)
LEGEND:
� GROUNDWATER ASSESSMENT MONITORING WELL
� COMPLIANCE GROUNDWATER MONITORING WELL
� VOLUNTARY GROUNDWATER MONITORING WELL N
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER NC 2L STANDARD FOR ARSENIC IS 10 pg/L
NON DETECT CONTOUR CONCENTRATION IS 0.5 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
ARSENIC ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-122
GASTON COUNTY, NORTH CAROLINA

300 0 300 600
SCALE (FEET)
LEGEND:
� GROUNDWATER ASSESSMENT MONITORING WELL
� COMPLIANCE GROUNDWATER MONITORING WELL
� VOLUNTARY GROUNDWATER MONITORING WELL N
ISOCONCENTRATION CONTOUR
NON DETECT CONTOUR
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER NC 2L STANDARD FOR ARSENIC IS 10 pg/L
NON DETECT CONTOUR CONCENTRATION IS 0.5 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
ARSENIC ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-123
GASTON COUNTY, NORTH CAROLINA

300 0 300 600
SCALE (FEET)
LEGEND:
Q� GROUNDWATER ASSESSMENT MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR N
NON DETECT CONTOUR
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER NC 2L STANDARD FOR ARSENIC IS 10 pg/L
NON DETECT CONTOUR CONCENTRATION IS 0.5 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
ARSENIC ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-124
GASTON COUNTY, NORTH CAROLINA

300 0 300 600
SCALE (FEET)
LEGEND:
Q� GROUNDWATER ASSESSMENT MONITORING WELL
Q� COMPLIANCE GROUNDWATER MONITORING WELL
Q� VOLUNTARY GROUNDWATER MONITORING WELL N
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
- - - NON DETECT CONTOUR
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER NC 2L STANDARD FOR BORON IS 700 pg/L
NON DETECT CONTOUR CONCENTRATION IS 50 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
BORON ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-125
GASTON COUNTY, NORTH CAROLINA

m
1!
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tlq 3d�
MW-9D
(<50U)
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:I•] :l•l ► ■ 64410I•K•
J
DUKE ENERGY CARQ
:ZIVERBEND STEAM
NAb, LLL:
MON ASH B,4
I

300 0 300 600
SCALE (FEET)
LEGEND:
Q� GROUNDWATER ASSESSMENT MONITORING WELL
ISOCONCENTRATION CONTOUR
--- I NON DETECT CONTOUR N
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER NC 2L STANDARD FOR BORON IS 700 pg/L
NON DETECT CONTOUR CONCENTRATION IS 50 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
BORON ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-127
GASTON COUNTY, NORTH CAROLINA

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DUKE ENERGY CAROLINAS, LLC
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;
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61
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i
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•
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4 ' ,/ 0.69 (0.69 )
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(1 5)
1�
39.7 (42.5)
ee ° e ♦ e
v
e °' +
.r
GWA
27.6 (25.3)
BG-1 S
A -1 3(1.9)
GWA-5S •............... i
♦ 1 e ••
• � GWA-4S '� GWA-23S ••• - � .
3.3 (3.1) •
- � •� � W � - SOS GWA-22S _ ,• p.� ♦. � 7 /-1 n ° � _A. ' _ice a �L � •� ,� 7 b-------' — - ,LL•_-.>'.�s.
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. Ll
01 -fi\ 0 r 64410IKe
0
in
ZEE 1101 ► Me] ► I rolM:41M Ii\:
DUKE ENERGY CAROLINAS, LI
:ZIVERBEND STEAM STATION 4
A 0 Ile

300 0 300 600
SCALE (FEET)
LEGEND:
� GROUNDWATER ASSESSMENT MONITORING WELL
� COMPLIANCE GROUNDWATER MONITORING WELL
� VOLUNTARY GROUNDWATER MONITORING WELL N
IMAC CONTOUR
NON DETECT CONTOUR
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER IMAC FOR COBALT IS 1 pg/L
NON DETECT CONTOUR CONCENTRATION IS 0.5 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
COBALT ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-132
GASTON COUNTY, NORTH CAROLINA

300 0 300 600
SCALE (FEET)
LEGEND:
Q� GROUNDWATER ASSESSMENT MONITORING WELL
IMAC CONTOUR
--- I NON DETECT CONTOUR N
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER IMAC FOR COBALT IS 1 pg/L
NON DETECT CONTOUR CONCENTRATION IS 0.5 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
COBALT ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-133
GASTON COUNTY, NORTH CAROLINA

1
Ar
a of f J[Yru
^ F p
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as x s
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. o
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50 l • RO©
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i �•'� ��' AB-71 ♦♦e
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`I ♦may .'� IGWA-6S,`
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2,200 (<50U) °
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10,
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GWA-4,'S ; ,��W, OS % 5'<50U) 50
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wow
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-
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rie
i i
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r
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GWA-3D � �ole,.• may.
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♦ U)
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3D I ,
(<50U) ,41 ®-- co BG-1D
AS-1 D 4V ;
107 (100) i
; GWA-5D 3,0,0
86 (<50U)
41
GWA-23D
' "> .♦ .''*GMA-20[5 33J (<'50U) GWA-22D : , y
GWA-4D . . 1.—. o _
• 660 *(;<501J)
62 (<50U) j�m 1 12,600 (<50U),-
♦ . ,
••-__-♦ •_� o-
✓� �,o�ati• - -
a°o, �•. _ moo-'�2,700 (<50 ) -
allow
000
I
RON
ISOCONCENTRATION
CO
3UKE
ENERGY
CAROLINAS,
LI
:ZIVERBEND
STEAM
STATION
A
K.-
0111:41M FA � l
I

300 0 300 600
SCALE (FEET)
LEGEND:
Q� GROUNDWATER ASSESSMENT MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR N
NON DETECT CONTOUR
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER NC 2L STANDARD FOR IRON IS 300 pg/L
NON DETECT CONTOUR CONCENTRATION IS 50 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
IRON ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-136
GASTON COUNTY, NORTH CAROLINA

N
- ��4
'_
}
{ 3
wh q-
4 sY
, + M W--15
33 (26)
r't� n '�:��',r� �w d ``� yQ♦� j � ee '�' TES _.
i ' �' �• o GWA-1bS41
w .•---.••� .'� 250 (240,)`
•
i4 --------- A00-98' (53) `. .'� i•
�. % GWA-1S ee so ��o00.,e •
:' A11 '
3
e 8
V�. ,� ► `ee • ; e�-.',8,3,00 (8,700 )
r ._.J_ 4'":...sue ,.' _ 2S�': _ v • •••__•
•
- _ MW 11 SR•
32 (29)
MW-5S�
� • iI A _ 1 S %39 (4�9 )
♦ �, 2�50 26 � �
♦ r s.
♦ s-1411
MW
•
/
I
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it
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i 95 (5fi') MW-14
r ,
4 .1
_z
J (3 J)�
_ _.. ._...M W.1 0
d �36 (3% 0
:.{� � ♦ ,; ,,,�GWA-8S,_.�`.
720 (760)
'x r--- 4 r
= t�
O
41,
F r riais?l^s't"h,'i r}" - s,y.»,;:" .ti Y • I� A'���' \, ; A'B-6S r ,I
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o •
•-•--• 5 1 .-_�♦ ♦ oo GWA-7S
�•_ •••-• �••-r• 1 O o
► ♦ o' 30 (16 )
� -.GWA'-3SA ��`•� �7 (4.6J) .♦♦.♦ ®I'
i i 12,T00, (V1,600) ., •��' �•.-50-......• i
i
fir' N i yr »�tr r, 'll ' • eee. ,� ,,♦ / �' ♦♦
Y
8 5 (77) .
9
e C-2S .--- ♦
ev 16
�• ee ee� e s `GW'A-6S
j Y ±;
4s- _ so �1;30b (1,10 0
AS-1 S 1 , .
` 1 900 (1 700) : �..
N • GWA-5S
- g goo' 1'90 1200 1
i� '000 .------ - - -
`--- GWA^2S -'---
i i - � h00---
*GWA-4SA-2081 (81) GWA-22S
\\ 120 (92) 150) ; 48,(44)
'+.� �3 ' 8MVV-8)0�MW-8S
♦ ,,. 4
at• J�"� �j `..T
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f
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am
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MW-3D
<5U (<5U) /$— `%
G'WA-10D `♦,
10 (<5U) ` ♦
'° `♦ r
GWA-1 D MW-4D
28 (<5U) 24J+ (22J+)
1 w s
� O
� s
MW-11 DR
9.1 (6.3)
y - r♦� MW-5D
. MW-2D ` AB-1 D
8.3 (7.7)
`.
AB -I D GA4, I
V1%A�9 o
s ;r
AB-4D ` • •
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10�.� ♦� - ..'ss - o♦ ® `-------------------,
r s ,t� �i yei' ba CCxF` •..'S � ♦ i. I � o
63
y tag ` `�..••
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AB-5D ♦�
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' 1 Y530 (430%)
<5U (<5U)
1
A •` ..'fit to a _ ,?:. / • I ... .. _ •.r.. ... ...Irv.
jg .
MW-9D I .% GWA-7D®'
- ---- 8.1 (4.6J)50
® • I ♦®
--_—___-
�i 9,200'&,(11,6000 `) I AB-8D, i
i oo 140 (`130) i
,I ok
oo / • 1 s
• o e • 1
o0 9.1 (7) , 1
t ® 1
� � 1
AS-3�D
<5L
�` ' • 2 <5U)Aml
As-
�G- WA23D i 5
i,,: i GWA-2D`D <5U (<5'U) ,O- GWA-22D
GWA-4D , . o , , h •
o0 28 (27) ; 0 15 (<5U) � � 1r20 (<5U)
o e a f' o `♦ 1 fi i
i
i, o-MW-8D
1 ,
J
W ��1
l `
GWA-5D
<5U (<5U1
BG-2D
<5U (<5U)
BG-1 D 1
27 '�(<5U)_
o /
V 000" t
0. • �
1Nl\IMWA
=SE ISOCa
ZEE 1101► [K•] ► I rol I l :a M Ii\
DUKE ENERGY CAROLINAS, LLC
:ZIVERBEND STEAM STATION ASH B,4

300 0 300 600
SCALE (FEET)
LEGEND:
Q� GROUNDWATER ASSESSMENT MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR N
NON DETECT CONTOUR
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER NC 2L STANDARD FOR MANGANESE IS 50 pg/L
NON DETECT CONTOUR CONCENTRATION IS 5 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
MANGANESE ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-139
GASTON COUNTY, NORTH CAROLINA

300 0 300 600
SCALE (FEET)
LEGEND:
� GROUNDWATER ASSESSMENT MONITORING WELL
� COMPLIANCE GROUNDWATER MONITORING WELL
� VOLUNTARY GROUNDWATER MONITORING WELL N
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
- NON DETECT CONTOUR
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER NC 2L STANDARD FOR SULFATE IS 250000 pg/L
NON DETECT CONTOUR CONCENTRATION IS 1000 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
SULFATE ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-140
GASTON COUNTY, NORTH CAROLINA

300 0 300 600
SCALE (FEET)
LEGEND:
� GROUNDWATER ASSESSMENT MONITORING WELL
� COMPLIANCE GROUNDWATER MONITORING WELL
� VOLUNTARY GROUNDWATER MONITORING WELL N
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR
- NON DETECT CONTOUR
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER NC 2L STANDARD FOR SULFATE IS 250000 pg/L
NON DETECT CONTOUR CONCENTRATION IS 1000 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
SULFATE ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-141
GASTON COUNTY, NORTH CAROLINA

300 0 300 600
SCALE (FEET)
LEGEND:
Q� GROUNDWATER ASSESSMENT MONITORING WELL
ISOCONCENTRATION CONTOUR
--- I NON DETECT CONTOUR N
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER NC 2L STANDARD FOR SULFATE IS 250000 pg/L
NON DETECT CONTOUR CONCENTRATION IS 1000 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
SULFATE ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-142
GASTON COUNTY, NORTH CAROLINA

_....... ..•..:a.,�.u�,....sskiih:s,. .u-._...a._s:.3':axs_.a.':_.. T..
nx
x a[■[ il y, +I��- �, r `Yas4`:, ri/ MW--15
A
227,000
•t ' u . �s .''41F K
, GWA-10S 60
`0
rr ' 109,000
°�. "
MW-3S ;
r ; 118,000 -
GWA-1 Sal 78,000
®,
MW-13
87,000
to
�MW-11SR
<25;I000U
4d
MW-5S e
58,000
M
So'000-GWA.-9S_-
:,
rn nnn
,.,.. ,', i .:1..ri.Fi. i
r
® GWA
h k'. ® 13 M
lo
ti-
2, 7 138,000
r � 69,009(25,000) -A,
T, n ir y per+ p
��� CgrlE;�i ,t eve:yc r' ✓' 4le' >.' a 4 GWA-CJJ � °o
85,000
4
�+• � .�, _ - ter - � - - - ` ` -
� � cf°` •;.., is aF �� r.d # 5 r it "��. }fix ' .'' i KSdk''• �° ° c r' , X ■i a e v a ' " N +zy ,
BG-3S
a� <-� � ��3.�>.r ,���a.:,. y r,r, �t `•r �.:-� 57,000� ♦
°ya k ' • ; Mw--1 S v
AB-6S
51"� � 60 000 296r,000
r
All,-' r
} {. �------------- 3 MW-9 r GWA-7S r
i s>� GWA�*3+SA 114,000 65,000J+i !t
i ' ♦'SO. t�`e 274,000� BG-2S
hl
JI
11101
AB-71 '
\ ♦ ♦ ♦♦ ,*'
%
i�j ; '�`., r; - ,_;:`. ♦ ♦ ♦ ♦ w------------------------- i
p ,%% ♦♦♦♦ ,♦♦ ,,`0 ®P' ®®® GWA-6 S
♦ . ♦ ♦ `%
♦ ,%% ♦♦ ♦ ♦ �♦ AS-2S PPP 25000
♦ � r, P
♦ %� ♦♦ ® J,2, - ,I BG-1 S
`% ♦♦ AS-1S `ro i <25,000U
N ♦♦` %`o,'W 750,000J- o
0
`� r -- GWA-5S
%• . , p.. _ <25,00ou
` Air
00
23
a !j ♦ - --- s �.iG 0 - a k .....
GWA 4�S` _ . I _
• � WA 2: GWA 22S
27, �D
Aso e - -
p . 187,000 31,000 av--<25,000U - -'
®I M� MW-8S
W-81
`0 � I 9
77,00<25,000U
y
0 � r
"
'
h
NO
{ 3
J 2
a's [ 6 1� k
wh q-
4 sx
''• 1 u d
Ol
At I
V
1 '
g
f 4 ..
E
a.
w
,
�� ��\ � �l E.`�.'��] ��I � ��.'��l A I ��y E.'��IK�] ► [y � ► � � :��r � [�] ► [Kt] ► � r�l I1:a ►�l I�\ �.'j : I�\ A ��
DUKE ENERGY CARQ
:ZIVERBEND STEAM -c-
NAb, LLL:
MON ASH B,4

i'7
60
4%. uu
t1p IF
MW-15D
241,000
CD
Ark,
GWA-10D
Rly 185,000
MW-3D
4�
141,000
%
%
t--XA/A -1 M %
- 11 1 1 - KANA/-An %
232,000 113,000
%
% %
%
MW-11DR %MW-5D
140,000
-1200 _$�6,000
MW-2D D
92,000
0 %
%
%
AB-
%
15900
1� "7 GWA-8D®
128,000 '1611
•
I It
rAB-3D
A546,000
40,
4F W.
n #40' 2,2 %
40'
;1 4600
4*
MW-lD mow,
4#
197,000 BIlk"
.o
_-4" oo4o
Y'
10
25600 -503,00'3'
0.000* GWA-7D
- - - - - - - - - - - - - - - - - 20 Ul
°oo�oo� -------- 176,000 C)
MW-9D C)
C)
G_WA* 3 D "0'243,000
.•2,39040-
'o QO 41\
AB-8D 41
361,000
1BG -2D—Ar
% 4%
% 261,000
AB-7D
326,000
------------------------- C,
152,OOOJ+
% 40' 40'
J* • GWA-6D
184,000J+ If
AS-3D 1 41
N 4OF 11 0,000j-
% BG-TD
41 it 4
AS-lD r 11 of '6 555,000lw
390,OOOJ-
GWA-5D 41
1W 41
% ok 137,000 ft a .0 lkiw 4#
GWA-23D
%
4. 196,000
GWA-20D WA-22D ----------
GWA-4D 40 �f 4
% 214,000
ll� 4p --
101,000 •2,900,000 �p " w 25000 Tlb,3
MW:89)
Ilk %%
% alp--
J# ��'111,000
fSQ
- - - - - - - - - - - - - - - - - - - - - - - - Za
W" MIX,
25000
OTIS
V,
* it-
r2 4L
DOTAL
DISSOLVED
SOLIDS
ISOCC
3UKE
ENERGY
CAROLINAS,
LLC
:ZIVFRRFND
STEAM
STATION
ASH
A
zlivi 1 [01 Ll KiKel Ll I Kol I I M M Fill � W a 0:
I

300 0 300 600
SCALE (FEET)
LEGEND:
Q� GROUNDWATER ASSESSMENT MONITORING WELL
NORTH CAROLINA 2L CONTOUR
ISOCONCENTRATION CONTOUR N
NON DETECT CONTOUR
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER NC 2L STANDARD FOR TOTAL DISSOLVED SOLIDS IS 500000 pg/L
NON DETECT CONTOUR CONCENTRATION IS 25000 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
TOTAL DISSOLVED SOLIDS ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-145
GASTON COUNTY, NORTH CAROLINA

300 0 300 600
SCALE (FEET)
LEGEND:
Q� GROUNDWATER ASSESSMENT MONITORING WELL
Q� COMPLIANCE GROUNDWATER MONITORING WELL
Q� VOLUNTARY GROUNDWATER MONITORING WELL N
NON DETECT CONTOUR
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER IMAC FOR THALLIUM IS 0.2 pg/L
NON DETECT CONTOUR CONCENTRATION IS 0.1 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
THALLIUM ISOCONCENTRATION CONTOUR MAP - SHALLOW WELLS (S)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-146
GASTON COUNTY, NORTH CAROLINA

300 0 300 600
SCALE (FEET)
LEGEND:
Q� GROUNDWATER ASSESSMENT MONITORING WELL
Q� COMPLIANCE GROUNDWATER MONITORING WELL
Q� VOLUNTARY GROUNDWATER MONITORING WELL N
IMAC CONTOUR
ISOCONCENTRATION CONTOUR
- - - NON DETECT CONTOUR
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER IMAC FOR THALLIUM IS 0.2 pg/L
NON DETECT CONTOUR CONCENTRATION IS 0.1 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
THALLIUM ISOCONCENTRATION CONTOUR MAP - DEEP WELLS (D)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-147
GASTON COUNTY, NORTH CAROLINA

300 0 300 600
SCALE (FEET)
LEGEND:
Q� GROUNDWATER ASSESSMENT MONITORING WELL
N
2.5
TOTAL CONCENTRATION
(2.1)
DISSOLVED
CONCENTRATION
U
LESS THAN
LABORATORY REPORTING LIMIT
J
ESTIMATED
CONCENTRATION
J+
ESTIMATED
CONCENTRATION (BIASED HIGH)
NOTES:
GROUNDWATER IMAC FOR THALLIUM IS 0.2 pg/L
NON DETECT CONTOUR CONCENTRATION IS 0.1 pg/L
• PARCEL DATA FOR THE SITE WAS OBTAINED FROM DUKE ENERGY REAL
ESTATE AND IS APPROXIMATE
• ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE
APPROXIMATE
• ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014)
• THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO
THE DEFINITION FOUND IN 15A NCAC 02L.0107(a)
• ALL CONCENTRATIONS REPORTED IN MICROGRAMS PER LITER (pg/L)
THALLIUM ISOCONCENTRATION CONTOUR MAP - BEDROCK WELLS (BRU AND BR)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST2015
FIGURE
10-148
GASTON COUNTY, NORTH CAROLINA

MIMI ;L
p-,
p
A ')0
'g.
61
4P#
Ah
4*
MW-lb
0
GWA-109*
9,)"
MW-3s 0.62J (0.3J
0.6J+ (0.54J+)
GWA- 1 S
.3- .)
1.9 (o86J
MW-13
1 ui (i Uj)
P MW-11SR
1.4 (1.3)
MW-5S
s < 1 U '(,0. 53J)
•
G-PA-9S
012J+ (0.42J+)
- UK,
44M,
GWA - 2S 2. 0%
mw-lo
"0-1.2 (0.46J)
♦GWA-8S
<lu (<lU)
Ar
4w 4w,
BG-3s
0.75J+ (0.7J+)
lo
% 2
I I
10 10 11 1 #
'dirAB1648
oF
10
MW-9 4b 10
•
2.7 (2. 1 J +) 4b♦3.5J+ ♦ (1 1 U J)
10
GWA-3SA %
%
1.3 (0.66J) A8,r8S
0.7pJ (0.37J) BG-2S
0. 35J (< 1 U)
�a
10
♦
AB-71
-1 U
<
%
V
% oIlk
C-2S
e %
A.
GWA-6S %
Ils
BG-1 S
%
AS-lS
1.6J+ (0.48J+)
GWA-5S
•
<lu (<lU)
GAkA-23S
'4
-4S *<lu (<lU)
GWA AtV•• GWA-20&
't
0.84J (0.37J) *-3' 23, 1 U4T. �, �r-
GWA-22S
% ftin. 4b
<lu (<lU)
INW-81 '"$r'WW-8S
• 2 -8 (0.94J ♦4.32J+ (0.45J+)
OP3-
-
i.7
Ill Ll F.�.11 I
JUKE t
nlxlCrnr!7
iGY CAROLINAS, LLC
7) STEAM STATION ASH R,4

I
zi-
4,
ov 4,
ow Ar
4� V
a
il
M•w,a of sr�A
o�Y#2
g�j
W
_X
41*
J# W_ 1 5D%
22.4 (23.6
40P
GWA-10D
If 1 6.8 (7.7) %%
MW-3D % %
6.2(5.8) % %
/7rl A /A %
Qy _lu . IMW-4D % %.
1
21 (16.9) .1 (<lU)
%
- I ivi vv
2.1
m
W- 5 E,)
MW-2D
4.7 (4.5)
0
4v 4OF J.
40P So
JI
4p
40P
40P ' A ♦G-9D •
2.812.3)
%
%
4F
40P
4? AB-4D
40'
40' 24(24.1)
GWA 41b g.
J# -8D •40
•
.4 55(5.5)
Ar• -ft
41
AB-3D
JI
11.5(7.4) ----
4----
@'3 --ow-3D
40P
41e.
D M W
%
AB-5D
2.1 jt9J+) 4#
•12.5 (12.7) % ok ok
------------------ ok
I0 %
00 %
0010 GWA-7D
MW-9D
-0 12.8 (12.5) 12.1 (11.6)
do
GWA-3D
4.6 (4.3) ----- B-8D
------------- BG-2D
.7* '(2.3
I •
29.9(29.2)
111011 CD
4# %
4# 4#
40.51 %
Z. - - - - --
- - - - - - - - - - - - - %
4#
%
%
J#
% 40P 4f
A
41
BG-lD
%
GWA
22 (20) 4# 41 4f
*0'
4.. -5D
% . . . . . . . .
3.9)�.o
'o 10
V fta
C GWA-2C 34.1 ) D "00000 000
2.4 (2.4 - .." "11% GWA-22D .o 0ow
-.4 GWA-4D `2.4 (0.66J)
'�P_18.5 (16.1 ram'----
WED-
MIL _L ---- --- ow
-----------
•
p �.MMAAL_ AL
Wan
Ill Ll F.�.11 I
DUKE ENERGY CAROLINAS, LLC
:ZIVFRRFND STEAM STATION ASH R,4
a
I

r Ff
r V
MIMI
•w,a of sr t. y r s k�tF x° 1
o JX , • i1' h z1 t
. .:, .< ..� � 't, ;' _,_ SFr u i i :a �-�.•''-+. ¢
a ..
y-ypr fi ,A A gpn Y 3 fk� PV' iv "4 .
6p
3
Woo
Rky i
.d ni . ♦♦♦ (�� 'k yam,
(y��'�3kg. I ' � Rr'i:. M �f..1".sa vf .• ♦♦♦♦ .� ��� M® :
t 1� rc."t �" .., ♦ I .
.,t, ' [, ... x �;:� �•�. sd' I�Y ' � III e` �, ♦♦ : .
J i
ok
IJ a®ems ♦♦♦
J.
ry
oo
J.
i )r ♦ o
wee
`a
J
a • J �O „ r e
. ', • J III ,, r, ♦e ♦ •
♦ J
♦ J I \
♦ J I 1 \
J.
77
♦ ° ! \
f \
.5 1
♦ 41 % 1 ,� i
.
.. vim: _. ♦°' , oGWA-2BR
♦ ♦♦
41
11 8 (12.3) i
♦ i e
41
; e, ♦♦♦,
B R
x,'�Sa� : ♦ ° �� t, \� ,eee ♦♦♦
\ e
lax
AB-6BRUeee ♦®♦♦
JJ 186
♦♦
is I '
J 1
♦ I ,, GWA-7BR ; ee ♦♦
". J. MW-9BR �% 10.9 (10.9) ' �`
I ♦ , e
7.8 (7.8) %41
�
e
s %
ee J
-
' ... _ _ J
♦ BG 2B
?. ♦ II ee 1
i L'..,Q _ eee•e : I 4.6 (2.7) i
u
I)L ♦ J®° O63
- _ — — — — — — — — —
— — — — — — — — —
41
,, r, ;,..:� �,� .. .- ,:; • J • _ _ - 7BR MW
f • r - �♦
2.1 (2.1)100
�••
1 - ' •••• low
00
0 low
>,
♦ 1 Is ••• ow
i
low
"j
• A- B_R woo
`% _ 4BR GWA-:20BR _ •,: •
GWA
' 0.49 (0.753) 1• W 22
�4 .
,; `x'.• _ ♦ eee _ I ' �� ,�• :
on'•
wow
♦ ..
1
I, Y
y '
-uvep..e.•
rm—
i- -
r� 4
DUKE ENERGY CAROLINAS, LI
:ZIVERBEND STEAM STATION 4
0l ►1 r0111:
MU1/�\►lII1MM

1 I 2 I 3 I 4 I 5 I 6 I 7
A
SOUTHWEST
800 r-
700 ; } —
GWA-4D GWA-4BR
GWA-4S
.-,
41
4-
z
0
a
J
W
M
GWA-4BR
/L
hromium
38.1
ed Solids
1,500,000
anadium
0.9
500 "'
0
GWA-4S
Ana lyte / L
Cobalt
Man anese
%fanadium
r"Idflgdrlese
AS-1D
Ana to
/ L
A.ntimon
ChroMium
aria
Vanadium
14.4
AS-2D
Ana to
/L
Chromium
22.5
\.`anadiL1111
34.6
200 400 600 800 1000 1200
DISTANCE (ft)
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
SECTION A
SCALE: HORIZ 1 "=100' rIG 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER, P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
1400
1600
NOT FOR
CONSTRUCTION
1800
2000
N 0 RTH EAST
1 800
101
)0
--1 500
2200
DUKE ENERGY CAROLINAS.LLC
10' DUKE
�14- ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
NOTE:
1. CONCENTRATIONS OF CONSTITUENTS OF
INTEREST IN GROUNDWATER REPORTED IN
UNITS OF MICROGRAMS PER LITER (ug/L)
ANALYTE
NC 21-
GROUNDWATER IMAC
ANTIMONY
1**
10
700
4**
700
2
250,000
10
1**
ARSENIC
BARIUM
BERYLLIUM
BORON
CADMIUM
CHLORIDE***
CHROMIUM
COBALT
COPPER***
1,000
IRON
300
LEAD
15
MANGANESE
50
MERCURY
1
NICKEL
100
NITRATE***
10,000
1,000
6.5 - 8.5
20
***
H field
SELENIUM
SULFATE***
250,000
THALLIUM
0.2
TOTAL DISSOLVED SOLIDS
500,000
_ 0.3**
1000
VANADIUM
ZINC***
** Interim Maximum Allowable Concentration (IMAC)
*** Unit reported in mg/L in standard, converted
here to Ng/L to match units displayed on figure.
All units shown in pug/L except pH which is
standard units.
NOTES:
U = NOT DETECTED ABOVE LABORATORY
REPORTING LIMIT
J = ESTIMATED CONCENTRATION
3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
*DNE = DOES NOT EXCEED
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
' F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >t 50% OR REC 5 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION A -A'
GROUNDWATER ANALYTICAL RESULTS
0 1" 2° FILENAME
SCALE I AS NOTED
0
Ire]
SHEET
FIGURE 10-152

1
2
3
2
5
7
SOUTHWEST
800
700
O
Ir—
C�
41 L-
z
0
a
j Z
w J
2
U
Q
600
500
2200
2400
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
2600
2800
ISSUE DATE DESCRIPTION
3000
3200 3400
DISTANCE (ft)
3600
SECTION A
SCALE: HORIZ 1 "=100' FIG 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER. P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
3800
NOT FOR
CONSTRUCTION
4000
4200
A'
N 0 RTH EAST
nnn
4400
DUKE ENERGY CAROLINAS.LLC
w DUKE
ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
NOTE:
1. CONCENTRATIONS OF CONSTITUENTS OF
INTEREST IN GROUNDWATER REPORTED IN
UNITS OF MICROGRAMS PER LITER (ug/L)
ANALYTE
NC 2L
GROUNDWATER IMAC
ANTIMONY
1**
10
700
4**
700
2
250,000
10
1**
ARSENIC
BARIUM
BERYLLIUM
BORON
CADMIUM
CHLORIDE***
CHROMIUM
COBALT
COPPER***
1,000
IRON
300
LEAD
15
MANGANESE
50
MERCURY
1
NICKEL
100
NITRATE***
10,000
1,000
6.5 - 8.5
20
***
H field
SELENIUM
SULFATE***
250,000
THALLIUM
0.2
TOTAL DISSOLVED SOLIDS
500,000
_ 0.3**
1000
VANADIUM
ZINC***
** Interim Maximum Allowable Concentration (IMAC)
*** Unit reported in mg/L in standard, converted
here to Ng/L to match units displayed on figure.
All units shown in jug/L except pH which is
standard units.
NOTES:
U = NOT DETECTED ABOVE LABORATORY
REPORTING LIMIT
J = ESTIMATED CONCENTRATION
3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
*DNE = DOES NOT EXCEED
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
' F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >t 50% OR REC 5 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION A -A'
GROUNDWATER ANALYTICAL RESULTS
0 1" 2° FILENAME
SCALE I AS NOTED
C
Is]
4-1
I_1
SHEET
FIGURE 10-153

1
2
3
2
5
7
W
B
WEST
800 1-
700
650
.11
5
5001--°
0
1 V�QI VIJJV1VgUU JVIIuJ GJ7VVVV
Vanadium 1 4.6
Ana lyte j L
Cobalt
18.4
Iron
42i i
Manganese
12700.1
Sulfate
142i1i1i10
Total Dissolved Solids
230i-i0 000
Vanadiuml
1.3
200
400
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
D. mes
C-2D
Analyte (Ng/L)
Vanadiuml 10.9
ISSUE DATE DESCRIPTION
-0
1000
1200 1400
DISTANCE (ft)
SECTION B
SCALE: HORIZ 1 "=100' rIG 11-1
VERT 1 "=25'
PROJECT MANAGER S. SPINNER. P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
1600
NOT FOR
CONSTRUCTION
1800
!11ILIIIIUII y I 1.L
Vanadiuml 12.5
2000
2200
DUKE ENERGY CAROLINAS.LLC
w DUKE
ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
2400
ELI
EAST
800
700
NOTE:
1. CONCENTRATIONS OF CONSTITUENTS OF
INTEREST IN GROUNDWATER REPORTED IN
UNITS OF MICROGRAMS PER LITER (ug/L)
ANALYTE
NC 2L
GROUNDWATER IMAC
ANTIMONY
1**
10
700
4**
700
2
250,000
10
1**
ARSENIC
BARIUM
BERYLLIUM
BORON
CADMIUM
CHLORIDE***
CHROMIUM
COBALT
COPPER***
1,000
IRON
300
LEAD
15
MANGANESE
50
MERCURY
1
NICKEL
100
NITRATE***
10,000
1,000
6.5 — 8.5
20
***
H field
SELENIUM
SULFATE***
250,000
THALLIUM
0.2
TOTAL DISSOLVED SOLIDS
500,000
_ 0.3**
1000
VANADIUM
ZINC***
C
-- -, C
10
** Interim Maximum Allowable Concentration (IMAC)
*** Unit reported in mg/L in standard, converted
here to Ng/L to match units displayed on figure.
All units shown in jug/L except pH which is
standard units.
NOTES:
U = NOT DETECTED ABOVE LABORATORY
REPORTING LIMIT
J = ESTIMATED CONCENTRATION
`0
3.0 = LESS THAN LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
i J— = ESTIMATED CONCENTRATION BIASED LOW
*DNE = DOES NOT EXCEED
I
i
i0
I
i
B
i
--1 500
2600
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH — ASH
' F — FILL
S — ALLUVIUM
M1 — SOIL/SAPROLITE; N < 50
M2 — SAPROLITE/WEATHERED ROCK;
N >t 50% OR REC 5 50%
TZ — PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR — SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION B-B'
GROUNDWATER ANALYTICAL RESULTS
1" 2" FILENAME
SCALE I AS NOTED
I_1
SHEET
FIGURE 10-154

1
2
3
5 1 6 1 7 1 8
WEST
8001
700
6aQ1
1
" O
Z
0
a LEI
�Ix
O
w O
LL-
600
550
500 1--
2600
2800
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
■1•
AIlt1nlCrn';" 1,71
811atjlLllll'4
3000
ISSUE DATE DESCRIPTION
AB-4D
3200
AB-4S
INTERMEDIATE DAM
WATER
IN BASI
AB-4S
Analyte (Ng/L)
Antimony
2.2
Arsenic
428
Cobalt
5.7
Manganese
1,200
Vanadium
j 166
3400
PROJECT MANAGER
3600
SECONDARY DAM AB-1D
AB-1D
Ana to / L
Antimony 6.3
Chromium 49.2
Cobalt 2.9
Iron
3lanadi�_ini 2i i
3800 4000
DISTANCE (ft)
SECTION B
SCALE: HORIZ 1 "=40' rIG 11-1
VERT 1"=10'
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
NOT FOR
CONSTRUCTION
4200
AB-1S
Ana to / L
Cobalt
15.'_a
Iro1n
510
P5'langanese
�ii
Vanadium
1.1
4400
MW-13
B'
EAST
---1 800
FIW-13
Ana to /L
Cobalt 23.7
Iron 15700
Nlanunese 8300
WMOUNTAIN ISLAND UkKE
----------
- r
DUKE ENERGY CAROLINAS,LLC
wAr DUKE
ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
4800
700
650
550
NOTE:
1. CONCENTRATIONS OF CONSTITUENTS OF
INTEREST IN GROUNDWATER REPORTED IN
UNITS OF MICROGRAMS PER LITER (ug/L)
C
ANALYTE
NC 2L
GROUNDWATER IMAC
ANTIMONY
1**
10
700
4**
700
2
250 000
10
1**
ARSENIC
BARIUM
BERYLLIUM
BORON
CADMIUM
CHLORIDE***
CHROMIUM
COBALT
COPPER***
1,000
IRON
300
LEAD
15
MANGANESE
50
MERCURY
1
NICKEL
100
NITRATE***
10,000
1,000
6.5 - 8.5
20
***
H field
SELENIUM
SULFATE***
250,000
THALLIUM
0.2
TOTAL DISSOLVED SOLIDS
500,000
0.3**
VANADIUM
ZINC*** 1000 C
** Interim Maximum Allowable Concentration (IMAC)
*** Unit reported in mg/L in standard, converted
here to Ng/L to match units displayed on figure.
All units shown in pug/L except pH which is
standard units.
NOTES:
U = NOT DETECTED ABOVE LABORATORY
REPORTING LIMIT
J = ESTIMATED CONCENTRATION
— 3.0 = LESS THAN LABORATORY REPORTING LIMIT II
J- = ESTIMATED CONCENTRATION BIASED LOW
g�P►I�1161 az%IMas] 2121WE
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
' F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >! 50% OR REC 5 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION B-B'
GROUNDWATER ANALYTICAL RESULTS
0 1" 2--FILENAME
SCALE I AS NOTED
4-1
I_1
SHEET
FIGURE 10-155

HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
PROJECT MANAGER S. SPINNER. P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINAS,LLC
w DUKE
ENERGY
GASTON COUNTY
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
CROSS SECTION C-C'
GROUNDWATER ANALYTICAL RESULTS
0 1" 2° FILENAME
SCALE I AS NOTED
SHEET
FIGURE 10-156

1
2
3
2
5
Al
7
W
MW
AB-6BRU AB-6S
HnMYLC 1N91 L.1
Manganesel
530
Vanadium
2.1
;TI
►\
AB-6BRU
Analyte (Ng/L)
Sample 1
Sample 2
Antimony
DNE*
2.5
Cobalt
DNE*
1.8
Iron
DNE*
970
Vanadium
11.9
18.6
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
1000
1200
ISSUE DATE DESCRIPTION
1400 1600
DISTANCE (ft)
Analyte (pg/L)
Antimony 7.5
Chromium 24.7
Vanadium 40.5
GWA-6D
D'
EAST
800
MW-7BR
ff
R MW-7D
MW-7SR
Ana a (Ng/L)
Chr mium 14
Iron 558
Man anew
pH (field)100000000
700
GWA-6S
Analyte (,Ng/L)
Cobalt 27.6
Ir n 1100
Manaane a 1300
1800 2000 2200 2400 2600 2800
SECTION D
SCALE: HORIZ 1 "=100' rIG 11-1
VERT 1 "=50'
PROJECT MANAGER S. SPINNER. P.G.
DRAWN BY:
-
DESIGNED BY:
-
CHECKED BY:
-
APPROVED BY:
-
PROJECT NUMBER
000000000246403
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINAS.LLC
w DUKE
ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
0
e
500
MW-7D
Analyte (Ng/L)
:)H (field)T 100000000
C
Al
4-1
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH — ASH
F — FILL
S — ALLUVIUM A
M1 — SOIL/SAPROLITE; N < 50
M2 — SAPROLITE/WEATHERED ROCK;
N >t 50% OR REC 5 50%
TZ — PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR — SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION D-D'
GROUNDWATER ANALYTICAL RESULTS
1" 2" FILENAME SHEET
SCALE AS NOTED FIGURE 10-157

1
2
3
2
5
A
7 1 8
E
NORTH
800
650
41
41
E'
SOUTH
0 200 400 600 800 1000 1200 1400 1600 vv
DISTANCE (ft)
HDR Engineering, Inc. of the Carolinas
N.C.B.E.L.S. License Number: F-0116
440 S. Church Street, Suite 900
Charlotte, NC 28202-2075
704.338.6700
ISSUE DATE DESCRIPTION
SECTION rE
SCALE: HORIZ 1 "=80' IG 11-1
VERT 1 "=40'
PROJECT MANAGER S. SPINNER. P.G.
DRAWN BY: -
DESIGNED BY: -
CHECKED BY: -
APPROVED BY: -
PROJECT NUMBER 000000000246403
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINAS.LLC
w DUKE
ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
NOTE:
1. CONCENTRATIONS OF CONSTITUENTS OF
INTEREST IN GROUNDWATER REPORTED IN
UNITS OF MICROGRAMS PER LITER (ug/L)
C
ANALYTE
NOT FOR
CONSTRUCTION
DUKE ENERGY CAROLINAS.LLC
w DUKE
ENERGY
GASTON COUNT)
RIVERBEND STEAM STATION
COMPREHENSIVE SITE
ASSESSMENT
NORTH CAROLINA
NOTE:
1. CONCENTRATIONS OF CONSTITUENTS OF
INTEREST IN GROUNDWATER REPORTED IN
UNITS OF MICROGRAMS PER LITER (ug/L)
C
ANALYTE
NC 2L
GROUNDWATER IMAC
ANTIMONY
1**
10
700
4**
700
2
250,000
10
1**
ARSENIC
BARIUM
BERYLLIUM
BORON
CADMIUM
CHLORIDE***
CHROMIUM
COBALT
COPPER***
1,000
IRON
300
LEAD
15
MANGANESE
50
MERCURY
1
NICKEL
100
NITRATE***
10,000
1,000
6.5 - 8.5
20
***
H field
SELENIUM
SULFATE***
250,000
THALLIUM
0.2
TOTAL DISSOLVED SOLIDS
500,000
0.3**
VANADIUM
ZINC 1000
*** I C
**
Interim Maximum Allowable Concentration (IMAC)
*** Unit reported in mg/L in standard, converted
here to Ng/L to match units displayed on figure.
All units shown in jug/L except pH which is
standard units.
NOTES:
U = NOT DETECTED ABOVE LABORATORY
REPORTING LIMIT
J = ESTIMATED CONCENTRATION
— 3.0 = LESS THAN LABORATORY REPORTING LIMIT II
J- = ESTIMATED CONCENTRATION BIASED LOW
�111LI 91161*az%IM2ay21211Ef
LEGEND:
WATER TABLE SURFACE (SUMMER 2015)
ASH - ASH
' F - FILL
S - ALLUVIUM
M1 - SOIL/SAPROLITE; N < 50
M2 - SAPROLITE/WEATHERED ROCK;
N >t 50% OR REC 5 50%
TZ - PARTIALLY WEATHERED ROCK;
REC>50% AND RQD <50%
BR - SOUND ROCK;REC >: 85% AND RQD >- 50%
CROSS SECTION E-El
GROUNDWATER ANALYTICAL RESULTS
0 1" 2--FILENAME
SCALE AS NOTED
4-1
I_1
SHEET
FIGURE 10-158

45000
40000
35000
30000
J
� 25000
c
0
L
r
� 20000
O
U
15000
10000
5000
0
MW-5S (WG)
MW-6S (WG)
MW-8D (WG)
MW-81 (WG)
MW-8S (WG)
MW-9 (WG)
■Alkalinity, CO3
■Alkalinity, HCO3
6000
21300
32800
21800
1100
42400
■ Calcium
889
11100
5760
2960
345
12400
■ Chloride
7000
6600
1200
7000
2200
■ Magnesium
845
6740
1320
920
246
3650
■ Nitrogen, NO2 plus NO3
54
41
24
35
■ Potassium
■ Sodium
10700
7310
10000
7580
10900
■ Sulfate
10200
36700
580
24600
F)
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
CATION /ANION CONCENTRATIONS IN SHALLOW WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-159
GASTON COUNTY, NORTH CAROLINA

600000
500000
400000
J
S
C
O
300000
r
O
U
200000
100000
0
AB-3S (PW)
A134S (PW)
AB-5S (PW)
AB-5SL (PW)
AB-7S (PW)
C-1 S (PW)
■Alkalinity, CO3
18000
■Alkalinity, HCO3
254000
69600
201000
40000
24100
11000
■ Calcium
42200
35300
79700
89900
13300
54600
■ Chloride
12900
6000
11500
7900
2100
9400
■ Magnesium
6380
6230
16900
677
4250
23500
■ Nitrogen, NO2 plus NO3
60
19
■ Potassium
5140
20500
14100
20800
4540
23600
■ Sodium
144000
19500
11400
9560
9040
21900
■ Sulfate
99300
88900
99600
208000
64800
559000
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
F)
CATION / ANION CONCENTRATIONS IN ASH BASIN POREWATER SAMPLES
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-160
GASTON COUNTY, NORTH CAROLINA

350000
300000
300000
250000
J 200000
a�
c
0
L
r
0 150000
U
100000
50000
AB-1 D
AB-1 S (WG)
AB-2D
AB-2S (WG)
AB-313R
AB-3D
A134D
AB-5D
AB-613RU
AB-6S (WG)
AB-7D
AB-71 (WG)
AB-8D
AB-8S (WG)
S-13 (WS)
SW-1 (WWSW-2
SW-3 (WS)
(WG)
(WG)
(WG)
(WG)
(WG)
(WG)
(WG)
(WG)
(WG)
■Alkalinity, CO3
211000
36400
86100
309000
27200
57800
27000
245000
110000
■Alkalinity, HCO3
72000
1900
107000
1600
19900
53900
92400
69800
9800
77300
28500
39600
12000
12000
106000
■ Calcium
123000
1170
64000
1130
31300
283000
32900
42600
92800
94400
70100
2030
61300
37700
8540
18900
16300
57000
■ Chloride
4900
5300
6400
3300
2200
6400
2500
4700
5400
8800
7200
1800
5800
5300
1200
5400
5400
5500
■ Magnesium
524
974
270
610
1930
141
571
1950
9370
57.9
726
12700
11700
2580
3720
3350
14400
■ Nitrogen, NO2 plus NO3
230
720
83
940
48
73
530
200
120
16
130
51
200
79
290
■ Potassium
6920
4040
18800
80200
8420
17000
43400
10200
8150
3710
5440
4940
9310
■ Sodium
7830
2960
11800
19800
50300
9950
18200
18300
8820
29500
5050
14000
14800
6960
4590
4780
10800
■ Sulfate
22800
690
22700
17000
144000
13100
56300
87000
15700
46500
6300
136000
132000
54100
55200
119000
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
CATION /ANION CONCENTRATIONS IN SURFACE WATER AND ASH BASIN WATER
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-161
GASTON COUNTY, NORTH CAROLINA

450000
400000
350000
300000
J
250000
c
0
r
L
r
200000
0
U
150000
100000
50000
o
Mor—
BG-1 D (WG)
BG-1 S (WG)
BG-2BR (WG)
BG-2D (WG)
BG-2S (WG)
BG-3D (WG)
BG-3S (WG)
■Alkalinity, CO3
401000
91300
■Alkalinity, HCO3
10200
75400
59000
22100
43200
28900
■ Calcium
83300
1460
24200
57600
11000
9430
6140
■ Chloride
6100
1900
2200
10000
8900
2800
4600
■ Magnesium
112
1330
3100
84.4
2210
2270
775
■ Nitrogen, NO2 plus NO3
30
40
500
1000
3900
1600
■ Potassium
130000
4880
■ Sodium
75600
7670
29200
7180
16400
7260
■ Sulfate
48400
580
8200
31100
2900
1100
2400
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
F)l
CATION / ANION CONCENTRATIONS IN BACKGROUND WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-162
GASTON COUNTY, NORTH CAROLINA

100000
90000
80000
70000
60000
J
S
C
O
50000
r
O
U
40000
30000
20000
10000
0
r
RBSWO01 (Seep)
RBSWO02 (Seep)
S-11 (Seep)
S-2 (Seep)
S-4 (Seep)
S-5 (Seep)
S-6 (Seep)
S-7 (Seep)
S-8 (Seep)
S-9 (Seep)
■Alkalinity, CO3
■Alkalinity, HCO3
2500
24600
13400
59200
25500
10700
30200
22400
43100
23200
■ Calcium
3530
12700
4050
43000
7990
6140
4730
3420
8520
7410
■ Chloride
4100
6800
6800
6500
7300
6600
6100
1300
6500
■ Magnesium
324
2720
2710
7930
6800
7400
7590
5980
2730
6460
■ Nitrogen, NO2 plus NO3
1200
990
45
310
96
29
45
12
1500
110
■ Potassium
2810
5180
■ Sodium
5480
7780
5850
6840
7440
7160
6830
7140
■ Sulfate
4700
18400
16500
89300
25400
35100
24500
1400
25600
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
F)l
CATION / ANION CONCENTRATIONS IN SEEP SAMPLES
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2015
FIGURE
10-163

1400000
1200000
1000000FEE
J
a� 800000
c
0
L
r
0 600000
U
400000
-
200000
-
AB-3BR (WG)
AB-6BRU (WG)
BG-2BR (WG)
GWA-20BR
GWA-22BR
GWA-23BR
GWA-2BR
GWA-2BRU
GWA-4BR
GWA-7BR
GWA-9BR
MW-15BR
(WG)
(WG)
(WG)
(WG)
(WG)
(WG)
(WG)
(WG)
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
CATION /ANION CONCENTRATIONS IN BEDROCK WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-164
GASTON COUNTY, NORTH CAROLINA

350000
300000
250000
200000
a�
c
0
r
r
0 150000
U
100000
50000
0
=F1
6
AB-3D
(WG)
A134D (WG)
AB-5D (WG)
AB-7D (WG)
AB-8D (WG)
AS-1
D (WG)
AS-2D (WG)
AS-3D (WG)
AB-1 D (WG) AB-2D (WG)
■Alkalinity, CO3
211000
36400
309000
27200
57800
110000
87000
37000
■Alkalinity, HCO3
72000
107000
53900
69800
77300
18000
■ Calcium
123000
64000
283000
32900
42600
70100
61300
111000
69900
20400
■ Chloride
4900
6400
6400
2500
4700
7200
5800
5700
4100
3100
■ Magnesium
524
270
141
571
1950
12700
258
740
■ Nitrogen, NO2 plus NO3
230
83
73
530
200
130
94
■ Potassium
6920
4040
80200
8420
17000
8150
3710
14200
6690
3760
■ Sodium
7830
11800
50300
9950
18200
29500
14000
30500
25000
12400
■ Sulfate
22800
22700
144000
13100
56300
46500
136000
21300
26000
18000
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
F)l
CATION / ANION CONCENTRATIONS IN DEEP WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-165
GASTON COUNTY, NORTH CAROLINA

1600000
1400000
1200000
1000000
J
S
C
O
800000
r
O
U
600000
400000
I
I
I
200000
0
U6
J
BG-1 D (WG)
BG-2D (WG)
BG-3D (WG)
C-21D (WG)
GWA-10D (WG)
GWA-1 D (WG)
GWA-20D (WG)
GWA-22D (WG)
GWA-23D (WG)
GWA-3D (WG)
■Alkalinity, CO3
401000
91300
3600
36600
35000
1370000
92500
98200
■Alkalinity, HCO3
59000
43200
98700
96100
148000
48200
44400
72900
■ Calcium
83300
57600
9430
23800
25600
47400
758000
44400
46400
437000
■ Chloride
6100
10000
2800
2200
6400
3200
9800
5700
2600
6500
■ Magnesium
112
84.4
2270
3150
5810
606
1240
50.3
113000
■ Nitrogen, NO2 plus NO3
30
1000
1600
25
18
190
59
55
46
■ Potassium
130000
4880
64400
16600
188000
34600
11400
■ Sodium
75600
29200
16400
11900
28300
15300
73900
29400
13800
48000
■ Sulfate
48400
31100
1100
1900
25900
8700
376000
23500
10600
1310000
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
F)l
CATION / ANION CONCENTRATIONS IN DEEP WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-166
GASTON COUNTY, NORTH CAROLINA

120000
100000
80000
J
C
O
60000
r
O
U
—
—
40000
20000
0
GWA-4D (WG)
GWA-5D (WG)
GWA-6D
(WG)
GWA-7D (WG)
GWA-8D (WG)
GWA-9D (WG)
MW-11 DR (WG)
MW-15D
(WG)
MW-1 D (WG)
MW-2D (WG)
■Alkalinity, CO3
59600
47900
113000
■Alkalinity, HCO3
50700
16900
81000
45400
30600
16100
18900
40700
■ Calcium
12300
28000
47800
24500
14600
14100
9150
52700
25300
6950
■ Chloride
3200
2100
2400
4400
6300
6700
5900
6200
7900
4600
■ Magnesium
2950
453
185
5480
9720
6390
6350
899
8250
4120
■ Nitrogen, NO2 plus NO3
110
21
84
12
13
320
82
■ Potassium
3200
8700
■ Sodium
9800
9360
9870
20200
4800
8250
6770
18300
9730
5930
■ Sulfate
4400
5000
15500
32300
23800
33200
36000
40100
86100
720
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
F)l
CATION / ANION CONCENTRATIONS IN DEEP WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-167
GASTON COUNTY, NORTH CAROLINA

300000
250000
200000
J
S
C
O
150000
r
O
U
100000
50000
0
MW-9D (WG)
MW-3D (WG)
MW-4D (WG)
MW-5D (WG)
MW-6D (WG)
MW-8D (WG)
■Alkalinity, CO3
75600
■Alkalinity, HCO3
53200
17000
73800
31000
32800
240000
■ Calcium
17100
10900
24300
14000
5760
72600
■ Chloride
6600
5400
6500
6600
1200
2700
■ Magnesium
8750
3850
12900
6950
1320
955
■ Nitrogen, NO2 plus NO3
32
18
140
41
460
■ Potassium
4350
■ Sodium
4040
7750
8170
6670
10000
16800
■ Sulfate
26700
30900
44600
34600
27600
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
F)
CATION / ANION CONCENTRATIONS IN DEEP WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-168
GASTON COUNTY, NORTH CAROLINA

400000
350000
300000
250000
J_
�
I
C
O
200000
c
d
c
U
150000
I
100000
I
50000
0
AB-1 S (WG)
AB-2S (WG)
AB-6S (WG)
AB-8S (WG)
AS-1 S (WG)
AS-2S (WG)
BG-1 S (WG)
BG-2S (WG)
BG-3S (WG)
C-2S (WG)
■Alkalinity, CO3
245000
■Alkalinity, HCO3
1900
1600
28500
350000
42000
10200
22100
28900
■ Calcium
1170
1130
94400
37700
167000
4870
1460
11000
6140
11800
■ Chloride
5300
3300
8800
5300
18300
2600
1900
8900
4600
3200
■ Magnesium
974
610
57.9
11700
34000
1310
1330
2210
775
4640
■ Nitrogen, NO2 plus NO3
720
940
16
200
320
40
3900
3600
■ Potassium
10200
9550
4700
8380
■ Sodium
2960
8820
14800
12900
8280
7180
7260
4040
■ Sulfate
690
15700
132000
231000
5200
580
2900
2400
60400
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
F)l
CATION / ANION CONCENTRATIONS IN SHALLOW WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-169
GASTON COUNTY, NORTH CAROLINA

1600000
1400000
1200000
1000000
J
S
C
O
800000
L
r
O
U
600000
400000
200000
0
GWA-10S (WG)
GWA-1 S (WG)
GWA-20S (WG)
GWA-22S (WG)
GWA-23S (WG)
GWA-2S (WG)
GWA-3SA (WG)
GWA-4S (WG)
GWA-5S (WG)
GWA-6S (WG)
■Alkalinity, CO3
■Alkalinity, HCO3
4300
25000
7800
2900
8400
32000
36300
17600
2700
9800
■ Calcium
5040
4160
2780
696
858
13200
367000
25200
915
1390
■ Chloride
5700
5200
8100
2800
2300
5800
6100
2900
980
2900
■ Magnesium
5840
3390
1160
431
435
7360
134000
8040
278
795
■ Nitrogen, NO2 plus NO3
120
14
480
320
26
23
■ Potassium
10600
■ Sodium
4620
6740
4430
2510
6490
44000
6660
2960
■ Sulfate
31000
980
36100
1420000
84700
1200
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
F)2
CATION / ANION CONCENTRATIONS IN SHALLOW WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-170
GASTON COUNTY, NORTH CAROLINA

70000
60000
—
50000
40000
—
a�
c
0
r
0 30000
U
20000
10000
0
GWA-7S (WG)
GWA-8S (WG)
GWA-9S (WG)
MW-10 (WG)
MW-11SIR (WG)
MW-13 (WG)
MW-14 (WG)
MW-15 (WG)
MW-1S (WG)
MW-3S (WG)
■Alkalinity, CO3
■Alkalinity, HCO3
32700
1200
5900
14600
57900
45800
3100
28200
43400
■ Calcium
6540
2070
2170
4290
9290
9340
6790
3930
2010
13800
■ Chloride
2600
6200
6800
6400
6000
4200
13500
6000
10700
7100
■ Magnesium
4360
6390
2760
2940
5990
4670
16500
3110
986
8850
■ Nitrogen, NO2 plus NO3
600
140
47
250
71
49
12
■ Potassium
4080
■ Sodium
6510
5970
6220
7500
3120
2550
9240
6090
4160
■ Sulfate
530
36000
26500
19500
37600
15700
30100
29000
1200
29900
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
F)l
CATION / ANION CONCENTRATIONS IN SHALLOW WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-171
GASTON COUNTY, NORTH CAROLINA

45000
40000
35000
30000
J
� 25000
c
0
L
r
� 20000
O
U
15000
10000
5000
0
MW-5S (WG)
MW-6S (WG)
MW-8D (WG)
MW-81 (WG)
MW-8S (WG)
MW-9 (WG)
■Alkalinity, CO3
■Alkalinity, HCO3
6000
21300
32800
21800
1100
42400
■ Calcium
889
11100
5760
2960
345
12400
■ Chloride
7000
6600
1200
7000
2200
■ Magnesium
845
6740
1320
920
246
3650
■ Nitrogen, NO2 plus NO3
54
41
24
35
■ Potassium
■ Sodium
10700
7310
10000
7580
10900
■ Sulfate
10200
36700
580
24600
F)
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
CATION /ANION CONCENTRATIONS IN SHALLOW WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-172
GASTON COUNTY, NORTH CAROLINA

30.000
25.000
20.000
0
15.000
10.000
5.000
0.000
AB-1 S (WG)
AB-2S (WG)
AB-6S (WG)
AB-8S (WG)
AS-1 S (WG)
AS-2S (WG)
BG-1 S (WG)
BG-2S (WG)
BG-3S (WG)
C-2S (WG)
GWA-10S (WG)
■ Sulfate: Chloride
0.130
0.000
1.784
24.906
12.623
2.000
0.305
0.326
0.522
18.875
5.439
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
F)2
SULFATE: CHLORIDE RATIOS IN SHALLOW WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-173
GASTON COUNTY, NORTH CAROLINA

250.000
200.000
150.000
.2
N
12
100.000
50.000
0.000
GWA-1 S (WG)
GWA-20S (WG)
GWA-22S (WG)
GWA-23S (WG)
GWA-2S (WG)
GWA-3SA (WG)
GWA-4S (WG)
GWA-5S (WG)
GWA-6S (WG)
GWA-7S (WG)
GWA-8S (WG)
■ Sulfate: Chloride
0.000
0.121
0.000
0.000
6.224
232.787
29.207
0.000
0.414
0.204
5.806
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
F)R
SULFATE: CHLORIDE RATIOS IN SHALLOW WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-174
GASTON COUNTY, NORTH CAROLINA

7.000
6.000
5.000
4.000
0
Nr
12
0
3.000
2.000
1.000
0.000
GWA-9S (WG)
MW-10 (WG)
MW-11SR (WG)
MW-13 (WG)
MW-14 (WG)
MW-15 (WG)
MW-1S (WG)
MW-3S (WG)
MW-5S (WG)
MW-6S (WG)
■ Sulfate: Chloride
3.897
3.047
6.267
3.738
2.230
4.833
0.112
4.211
1.457
5.561
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
SULFATE: CHLORIDE RATIOS IN SHALLOW WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-175
GASTON COUNTY, NORTH CAROLINA

NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
SULFATE: CHLORIDE RATIOS IN SHALLOW WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-176
GASTON COUNTY, NORTH CAROLINA

9.00
8.00 -
7.00
6.00
5.00
-
0
N}I
4.00
3.00
2.00
1.00
0.00
BG-1 D (WG)
BG-1 S (WG)
BG-2BR (WG)
BG-2D (WG)
BG-2S (WG)
BG-3D (WG)
BG-3S (WG)
■ Sulfate: Chloride
7.93
0.31
3.73
3.11
0.33
0.39
0.52
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
H)�
SULFATE: CHLORIDE RATIOS IN BACKGROUND WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-177
GASTON COUNTY, NORTH CAROLINA

30.0
25.0
20.0
0
15.0
10.0
5.0
0.0
AB-3S (PW)
AB-3SL (PW)
A134S (PW)
A134SL (PW)
AB-5S (PW)
AB-6S (PW)
AS-7S (PW)
IB-1S (PW}
■ Sulfate: Chloride
24.9
2.6
2.1
16.8
2.0
6.5
7.8
17.5
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
H)�
SULFATE: CHLORIDE RATIOS IN POREWATER
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-178
GASTON COUNTY, NORTH CAROLINA

14
12
10
8
0
N}1
6
4
2
0
RBSWO01 (Seep)
RBSWO02 (Seep)
S-11 (Seep)
S-2 (Seep)
S-4 (Seep)
S-5 (Seep)
S-6 (Seep)
S-7 (Seep)
S-8 (Seep)
S-9 (Seep)
■ Sulfate: Chloride
0
4.49
1 2.43
13.13
1 3.91
4.81
1 3.71
0.23
0.00
3.94
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
H)�
SULFATE: CHLORIDE RATIOS IN SEEP SAMPLES
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-179
GASTON COUNTY, NORTH CAROLINA

18.00
16.00
14.00
12.00 -
10.00
-
0
r
12
8.00
6.00
4.00
2.00
0.00
AB-313R (WG)
AB-613RU (WG)
BG-2BR (WG)
GWA-20BR
(WG)
GWA-22BR
(WG)
GWA-23BR
(WG)
GWA-2BR (WG)
(WG) GWA-213RU
GWA-4BR (WG)
GWA-7BR (WG)
GWA-9BR (WG)
MW-15BR (WG)
MW-7BR (WG)
MW-9BR (WG)
■ Sulfate: Chloride
7.73
16.11
3.73
3.05
2.84
9.00
7.60
0.23
1.44
7.17
0.00
5.27
1.47
2.86
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
H)�
SULFATE: CHLORIDE RATIOS IN BEDROCK WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-180
GASTON COUNTY, NORTH CAROLINA

LJ.VV
20.00
15.00
-
0
a
Y
10.00
5.00
0.00
AB-1 D (WG)
AB-2D (WG)
AB-31D (WG)
A134D (WG)
AB-51D (WG)
AB-7D (WG)
AB-8D (WG)
AS-1 D (WG)
AS-2D (WG)
AS-3D (WG)
■Sulfate:Chloride
4.65
3.55
1 22.50
5.24
1 11.98
6.46
23.45
3.74
6.34
5.81
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
H)�
SULFATE: CHLORIDE RATIOS IN DEEP WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-181
GASTON COUNTY, NORTH CAROLINA

250.00
200.00
150.00
-
0
N}I
100.00
50.00
0.00
BG-1 D (WG)
BG-2D (WG)
BG-3D (WG)
C-21D (WG)
GWA-10D (WG)
GWA-1 D (WG)
GWA-20D (WG)
GWA-22D (WG)
GWA-23D (WG)
GWA-3D (WG)
■ Sulfate: Chloride
7.93
3.11
0.39
0.86
4.05
2.72
38.37
4.12
4.08
201.54
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
H)�
SULFATE: CHLORIDE RATIOS IN DEEP WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-182
GASTON COUNTY, NORTH CAROLINA

12.00
10.00
8.00
0
6.00
4.00
2.00
0.00
GWA-4D (WG)
GWA-5D (WG)
GWA-6D (WG)
GWA-7D (WG)
GWA-8D (WG)
GWA-9D (WG)
MW-11 DR (WG)
MW-15D (WG)
MW-1 D (WG)
MW-2D (WG)
■ Sulfate: Chloride
1.38
2.38
6.46
7.34
3.78
4.96
6.10
6.47
10.90
0.16
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
H)�
SULFATE: CHLORIDE RATIOS IN DEEP WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-183
GASTON COUNTY, NORTH CAROLINA

12.00
10.00
8.00
0
6.00
4.00
2.00
0.00
MW-3D (WG)
MW-4D (WG)
MW-5D (WG)
MW-6D (WG)
MW-8D (WG)
MW-9D (WG)
■ Sulfate: Chloride
4.05
5.72
6.86
5.24
0.00
10.22
NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
H)�
SULFATE: CHLORIDE RATIOS IN DEEP WELLS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-184
GASTON COUNTY, NORTH CAROLINA

NOTE: Cell value of 0 indicates analyte result is non -detect or not reportable.
SULFATE: CHLORIDE RATIOS IN SURFACE WATER AND ASH BASIN WATER SAMPLES
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
DATE
AUGUST 2015
FIGURE
10-185
GASTON COUNTY, NORTH CAROLINA

O Ash Basin Porewater
O Ash Basin Water
y
o0x `�0 00 O Background Monitoring Wells
= c-is
y �
Q SWA �G
pN AB-5SL �x
0 SW-2 Om
sr
Z SW-3 A�B-7S
�3
Ur
VO
0
Calcium
CATIONS
ti
o do �0 000 00
n
Chloride+Nitrogen, NO2 plus NO3
ANIONS
NOTE: Nitrate plus Nitrite was reported by the laboratory and is used here. Equivalent weight of 54 used (average of nitrate and nitrite).
DATE
PIPER DIAGRAM -ASH BASIN POREWATER, WATER, AND AUGUST 2015
F)""Z BACKGROUND MONITORING WELLS
DUKE ENERGY CAROLINAS, LLC FIGURE
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY. NORTH CAROLINA 10-186

�m
M"cd
C-is
y p
Q SW
N �x
ZO OOL SW-2
C' S-2 7
S-5 �sr
Z SW-3 AB-7S
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oCa2 �O S 9 b0
Ur
VO
0
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Calcium
CATIONS
❑ Ash Basin Porewater
❑ Ash Basin Water
❑ Seeps
ti
o do �o 00
n
Chloride+Nitrogen, NO2 plus NO3
ANIONS
NOTE: Nitrate plus Nitrite was reported by the laboratory and is used here. Equivalent weight of 54 used (average of nitrate and nitrite).
DATE
PIPER DIAGRAM -ASH BASIN POREWATER, WATER, AND AUGUST 2015
SEEPS
DUKE ENERGY CAROLINAS, LLC FIGURE
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA 10-187

1�00
0
Ash Basin Porewater
GWA-3SA
,fp
GWA-313
0
Downgradient "S" Wells
y
0
Downgradient "D" Wells
=O
c-is
d
y
GWA-10S
0
Downgradient "BR" Wells
QMWAD
p�
00
AB-8S
ABSSL
z
C' AB -BD
�m
GWA-8S
MW-11DR MW-11SR
G3
Z
MW-15
a0 GWA-2S
O
oC O
GWA-8D
AB-7S
GWA-9D
b
Ur
AB-5 S
AB-1 S
ABSBRU
c0
ABdS
ti
GWA-7BR
AB5D
AB-1D AB-2D
/ AB-3D 0
O
C
GWA-7D
0
Calcium
CATIONS
Chloride+Nitrogen, NO2 plus NO3
ANIONS
NOTE: Nitrate plus Nitrite was reported by the laboratory and is used here. Equivalent weight of 54 used (average of nitrate and nitrite).
DATE
PIPER DIAGRAM -ASH BASIN POREWATER, WATER, AND AUGUST 2015
DOWNGRADIENT "S", "D", AND "BR" MONITORING WELLS
DUKE ENERGY CAROLINAS, LLC FIGURE
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY. NORTH CAROLINA 10-188

1�00
0
Ash Basin Porewater
�m
� O
0
Ash Basin Water
'A do, 0o O
Upgradient "S" Wells
GWAAS o-1s oG 0
Upgradient "D" Wells
\J=�
Q 0
Upgradient "BR" Wells
�0N 6+0 SW 1
'
SW-2
AB\ �G
Z SW-3 3
2
oCa �O AB-7S b0
Ur
AMS AB-4S
�O ti
GWA-20S
GWA-22BR
GWA-6D
O
O
GWA41311 GWA-6S
GWA5D
GWA-4D
100
100
GWA-20BR
C-1S
GWA-22D
A13-3S
GWA45
O
80 ti V.0
c' sw-2 80
SW-1
AB-5SL
�C
�J b0 7i3O �.E� Y
AB-7S
�G�
c 60 o x
60 y
m
b, 11.JIV 00�
A64S
G
SW
o c
0111,
40 ��
40
GWA4S C-1S GWA-20S AB5S
SW-3 SW-1 AB-7S GWA-6S AB-3S/
SW-2
00
20 O GWA-6D
AB -SS
20
/GWA4D GWA-22D
GWASD A13-5SL GWA-513 AB4S GWA41311 GWA4D
GWA-6S
GWA-20S
GWA4BR GWA-20BR WA-22D
GWA-22BR As S 00 �O GWA-22BR
GWA-SD
0
�$ 00 00 po `'0 0 o do
bo 00
eo 00
GWA-20BR
Calcium Chloride+Nitrogen,
NO2 plus NO3
CATIONS
ANIONS
NOTE: Nitrate plus Nitrite was reported by the laboratory and is used here. Equivalent weight of 54 used (average of nitrate and nitrite).
PIPER DIAGRAM -ASH BASIN POREWATER, WATER, AND
DATE
AUGUST 2015
UPGRADIENT "S", "D", AND "BR" MONITORING WELLS
DUKE ENERGY CAROLINAS, LLC
FIGURE
RIVERBEND STEAM STATION ASH BASIN
10-189
GASTON COUNTY, NORTH CAROLINA

1�00
O Ash Basin Porewater
�m
�
O Ash Basin "S" Wells
y do,
0o O Ash Basin "D" Wells
�x
=O
Col. O Ash Basin "BR" Wells
y
-
Q AB-8S
C-1 S
�"
ON
6o
^ AB-8D
7�
2
AB\SSL sue.
�3
' Ir AS-1S
O
oC O �
AB-7S b
Gr
ABA S
VO A13-5S
ABdS ti
AB-1D AB-2D A13-51)
O
O
AS-2 D ABJ
AB-4
C-2D
100 AS-3D
100
A13-31311
C-1S
AS -2S
O
ti
A13-3S AB-8S
80
00� a 80
N
AB-5SL
C
AB 7S
mJ�
C 60
b0 0
o
a AB-8D
x 60 y
AB�s m
00`�
c
3
�
o
As-1s
rn
40
�� 40
AB-8D AB-8S C-1S ABAS
ABSS
AB -SS
AB-5D�
AS-1 5
\ AB-7S
AB-3D AB-3S
Z\/
00
20 AB-3D C-2D AMD AS-2S
O
AB-3BR AS,3 20
AB-SSL
AB-4�
C-2D 2S AB-1S
Ag p
AS-3D
AS
AB-2D
AB-2D
AB-iD
AB-3BR AB�S 00
�O ABAD
0
�$ do'
00 p0 a0 O
O ry0 b0 00 00 00
Calcium
Chloride+Nitrogen, NO2 plus NO3
CATIONS
ANIONS
NOTE: Nitrate plus Nitrite was reported by the laboratory and is used here. Equivalent weight of 54 used (average of nitrate and nitrite).
PIPER DIAGRAM -ASH BASIN POREWATER, "S", "D", AND "BR" MONITORING WELLS
DATE
DUKE ENERGY CAROLINAS, LLC
AUGUST 2015
1111111111111)"'Z
RIVERBEND STEAM STATION ASH BASIN
FIGURE
10-190
GASTON COUNTY, NORTH CAROLINA

J-m
'A c>'o 00o ❑ Ash Basin "S" Wells
d
=O
\may �r El Seeps
o-Ov
AB -as G�z
610
C• s-z ���
�3
Z S-5
c0 S-11 ti
z AZ
O O
�$ do' 00 QO `'O O
Calcium
CATIONS
n
o do �o 00 00 00
Chloride+Nitrogen, NO2 plus NO3
ANIONS
NOTE: Nitrate plus Nitrite was reported by the laboratory and is used here. Equivalent weight of 54 used (average of nitrate and nitrite).
DATE
PIPER DIAGRAM - ASH BASIN "S" WELLS AND SEEPS
DUKE ENERGY CAROLINAS, LLC AUGUST 2015
RIVERBEND STEAM STATION ASH BASIN FIGURE
10-191
GASTON COUNTY, NORTH CAROLINA

DETECTION MONITORING CONSTITUENTS DETECTED IN SHALLOW WELLS
N
Analyte
Abbreviation
Boron
B
Calcium
Ca
Chloride
CI -
pH (field)
pH
Sulfate
SO4
Total Dissolved Solids
TDS
NOTES:
U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMIT
J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN THE LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
pG/L: MICROGRAMS PER LITER
LEGEND
ASH BASIN ASSESSMENT
GROUNDWATER MONITORING WELL
ASH BASIN COMPLIANCE
GROUNDWATER MONITORING WELL
ASH BASIN VOLUNTARY GROUNDWATER
MONITORING WELL
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
COINCIDENT WITH DUKE ENERGY
PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH STORAGE
DUKE ENERGY PROPERTY BOUNDARY
DATE
500 0 500 1, 000
SCALE (FEET)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
AUGUST 2015
FIGURE
10-192

N
Analyte
Abbreviation
Boron
B
Calcium
Ca
Chloride
CI -
pH (field)
pH
Sulfate
SO4
Total Dissolved Solids
TDS
NOTES:
U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMIT
J = ESTIMATED CONCENTRATION
<3.0 = LESS THAN THE LABORATORY REPORTING LIMIT
J+ = ESTIMATED CONCENTRATION BIASED HIGH
J- = ESTIMATED CONCENTRATION BIASED LOW
pG/L: MICROGRAMS PER LITER
LEGEND
ASH BASIN ASSESSMENT
GROUNDWATER MONITORING WELL
ASH BASIN COMPLIANCE
GROUNDWATER MONITORING WELL
ASH BASIN VOLUNTARY GROUNDWATER
MONITORING WELL
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
COINCIDENT WITH DUKE ENERGY
PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH STORAGE
DUKE ENERGY PROPERTY BOUNDARY
DATE
500 0 500 1, 000
SCALE (FEET)
DETECTION MONITORING CONSTITUENTS DETECTED IN DEEP WELLS (D)
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
AUGUST 2015
FIGURE
10-193

21� r
.�? •ate"
Ad
e
r
MAW JW. III
NNW
3 a.
iL
O H �y�s k fir s:; p..r:•
a�
z
.TWI. Al
1
r
71n�*
x `A
100 . 1 �►
00 I
` I I�♦
M � -i—�
to A
i
i
;a
y_
_ � r
-
•s ,
Off
-Sample Date
Constituent (pg/L)
.yamConstituent (pg/L)
�'� . _ • � 111 .; a a � 1 111 �� , � '�'s� ...fir �.�'�+*'' . �� � •' ..i � � x � �� ^''� -, ' .J,,'�,-.w� - --- - _ _ _
Me-
'��dnfflf Moo
w ti 00 OIM r I
�. - � ).. - .� + .. � ` •3. _ .� - ,rye,• � s� � f � �ti -:� � � r'.
DETECTI
• \ 11 • ► • : \ • \ \ ► • 1
DUKE ENERGY GAKULINA5, LLG
RIVERRFND STEAM STATION ASH B,4

_� 7 _� r , �..,; 4 -- - I I . .I, r,. irk. ,z�. - �- r-:tee'-_s'
,- : T. Lir.,,
- - . I.,
t.. _ _y ,4 •t --, [ - ,,Q a:�, - y ; a fC';. a a .,,f _', , , p y. �� 6. .. F�
41. - i ' t `j�" % � k ►` y,� �� ', -t _7 - Sample MW-15
,.' �: f ''' , � r `, 1� .�. - : Sample Date 6/23/2015
tiAi-
",.� �_. y 119-11, y# x �. ITT 4Jy� .l¢ Sample MW-3S Constituent (NgIL)
' ,�" .�' e11
g4.1 illi� Sample Date 6/30/2015
As 0.25 J
f eti x` +0 ITr.r Constituent /L Ba 86
- h . •k {f",.� • ram:,..` •w, -* ' i V, , n' - , ?"'10 .- . . , �., �`{ y. , 'e. X'!," ,:- . ' q
¢ � ,, g� ;,' �. V + 41�r .� r Ba 17 Be 0.22
eel
:'�/` r ' , : , , ` ri y �, : ;,. ! 4 I ;�► - ,. AN Co 0.14 J Co 1.3
R' - , 1 44 I i"
.",w,•..
Ift.'1 I " :.: Cr 6.8
-' >A, - - i . ..fL
,RR
R•
�y�
3s
i'
_ �'.
li `
• -A r+ t .. yIf I 1. ,.� ,
;, r �+ . t r 7y��/�r+ s P b 0.24 g
' .•. . 1.
• `t �:/.
Pb 0.6
- .
-
F� `
a x r`4 yr a' `x Se 2
s+!'
r
.- F
. - 'Ili. >' .. `Y. ., � `3' � < - Sample ,�• p GWA-is
,r- 1 .
4 d
if k 7/2/2015
�- � .•.fir. _ n�
T: r .fi.
.}
R ,I'
� ••�= Sample Date
r-
4 E
" Y s !r.% Constituent /L
,. (Ng )
{ p11
G'
y� k'
-h -
C
•K' Y
,
.
:c
Ba 60
'01,
►, r r ♦'
r . ��••..,, _ Y t. y
r a »
a .A "�
r� � "i
d '•2 ,
'Jr� yt
Y F-
,
Co1. 2.1
K'
_ !f •r
Y �i T '
�1
{:' k
dr i M
R
G 4
3r Cr 11.6
v
.••a
1 ,y,
4 rK� . } '}.
r'`fjrr 3• j!
_-
.R
i, 1r �' t
k Y
d}
t
r^ -
Y
c c
Pb 0.21 J
u
1
*'-1, : .
"2
:" �,
Sb 0.28 J
- *
. ,
},
- , I
'7r
T Y �, f l
- 11
f' `r Sam le
,I
-vw
.3� MW-11S
' i
,. rtt G
.... I
a .''_ v *-
Sam le Date
7 2 2015 p
s s}R . }
4
t' -
r r ,,s- ! "r -
3- r Constituent /L
trJ -: e�ri• ., .. �.;- r ,,r• -;r y ,i►,' ., _Ir (Ng ) '��•' �.
���
i .i
S.
f i
F' - - �j zj
I Y-.J L. _
.�-�• � Ba 25 z.
' <
a.
1 Y �� Y
4'
r' _
F
Y-
i`
r
3'11
-
Cd 0.026 J
�'
t !
r
n
,
>� r 't
Cr 1.8 J
f }.
•. r
•
s
•r f
+ * ,
- �: �'1. -Iwk ,
4 � ,j, - t - - - ;; �-
, � I.;" 71;�o �;`­.� "-� ( I I . '. 1- , . I . t.,! I
.4 I.... I --- J � - 0. ,
`'�^t s s:• ' V
12 'r .4,�' `
t x. `Ai r -t ..,� V
,,
F -•� -_
f'
.S�� ,rT
`
:.�.
M
_ , , = .'
.9- . A, w 1r, " I . ;.� "
,
Sample AB-6S ' -- - Sample GWA-2S
Sample Date 6/22/2015 ` 1 _ % Sample Date 6/22/2015 �,' * ti,
Constituent (Ng/L) Constituent (Ng/L)
f b.
As 0.82 *.: As 0.28 J
.
.
Co 0.31 J Co 0.34 I . `•
Cr 1.2J+ Sample MW-10 Cr 2.8J+.
' Mo 7.6 Sample Date 6/23/2015 Hg 0.088J+
.. Pb 0.19 ' ' Constituent (Ng/L) Mo 0.1 J •
.-
Sb 1.8 As 0.16J Pb 0.076J
Sample AB-8S Ba 56 f
Sample Date 6/20/2015 _ Se 2.6 _11
Be 0.15 J
Constituent (Ng/L)
Cd 0.082 r r :
Ba 130 Co 0.9 r ;�. , .I
- ar
Be 0.18 J Cr 2.7 _
Cd 0.16 , Sample MW-is
Co 0.55 Sample Date 6/29/2015 Hg 0.00
Cr 3.8 Constituent (NgIL) Pb 0.15
' ., " Ba 22 Se 0.53
Hg 0.11 J+
_ Se 1.2 Co 61
TI 0.02 J Cr 0.57 J+
Mo 0.12J
,. - _ P b 0.064 J
�~ ''
��.�,,
34'' W-9C� BLY NOT MW-9D- CJM-$` ' ,*
,r
- Sample Date 7/2/2015 .
Constituent (Ng/L)
AS 0.28 J
Ba 23
-a e Cr 27
'- Mo 7
.F' 1 Pb 0.091J+
Sb 2.7
Sample GWA-3SA Se 0.38 J
Sample Date
7/1/2015
Constituent
(Ng/L)
As
0.23 J
Ba
100
Cd
0.19
Co
18.4
Cr
0.53 J+
Mo
0.56 J+
Pb
0.14J+
Sb
0.77 J+
Se
5.7
Sample
Sample Date
C-2S
1 6/19/2015
Constituent (Ng/L)
As 0.95 J+
Ba 36
Be
1.9
Cd
Co
0.21
39.7
Cr
0.64 J+
Hg
0.27 J+
Pb
pr
0.2
Se
1.5
TI
0.09 J
Iz .1,
i R
, ,>
l j ,
�i "7a 5 - ,,fi
o• r
•t
-.-
I.
Sample GWA-10S
Sam le Date
p 7/ 2/ 2015 fir'. `41' +r.
a
.•
t
t +M.
{ h
Constituent /L �:
�,
K. Y O , �. ,
Y � •1 ,
t
Ba 29
f1 n S. .f _ J Pa
1
r .•. ' t
i` - h-
w`' L
y 6
ar �•
Be 0.11 J
.r' :l 7
a = - i.
N _4'
4c41.
9 1 t
�ti
R
•b Cd 0.032 J # r � i' 'i4.1
4 A*,,t,i:
rs! •+�, ,� :s i
- . jai 4 ' . Y
:
,
•
a: '..
_
CO 10 .y3� r <
- R
.u, Y, w
0.
-', r
• ,
i K
F:. t
1
r. -
A
.n
Cr 3.5 J � �; '� .
4.,
- i 4
W.
ok i
,T
y:
a 1,.'
4
h
4
Y.� k
r
Sam le S
p
MW-13 _
w
.� c
, - Z"'
%
r
r
Sample Date
L•
6/30/2015 _ •.
c= z
•r
_
{. �?, r
aF
a
n . .a .
' Constituent /L
(Ng ) -
:'
,i
' _ i y
-. S
,ti.
v ,
, 'k r a
r'
^.. y
>!' i r c Y
•LY � f
As 0.39 J - ��
V (�� ». t
.,i jj
M a.T
I�
- 1 t. d•
Ba 300
y..
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1.
i
N.
t
_
r
x i
F -
�:
P. .
.
4 Co 23.7 zK
Y
s
f
y
i
r
Sam le - <. , ?�f'' i'
W Cr 0.38 J+ p AB 1S �, '� '
4 _ --
s
y,
i:l -1
. k
4
- r \, r
Sample Date �� } 9
11 H 0.072 J p i' �e I
g
-
r
J' ,
't`
<:
Constituent /L t'
(Ng ) �,.
TI 0.072 J
As 0.17 J
Ba 21
Be 0.12J
Cr 1.8J+ t �:
Hg 0.11 J+'- I S
Mo 0.17 J t ,41 -,;� +
Pb 0.18
Sb 3.2 - I . - ­ is . . . . .
.
Sample MW-5S
Sample Date 6/25/2015 't : , �� I
Sample AB-2S
Constituent (NgIL)
"" t�r. • : - Sample Date 7/8/2015
Ba 22 fir > Constituent /L
Be 0.072 J (Ng )
Pl-�,,,`yi� As 0.2 J
Co 1.9 r.
Cr r "I1.7 Ba 28
Be 0.15 J
Hg 0.26
Pb 0.062 J Cd 0.065 J
- Co 17.1
Se 0.29 J
Cr 2.5 J+
Sample GWA-7S
Sample MW-6S Mo 0.24J
Sample Date 6/18/2015
Pb 0.29 Sample Date 6/19/2015
Constituent (NgIL) Sb 3.1
Constituent (Ng/L)
Ba 8.4 M E " 0.072 J As 0.2 J+
Ba 39
�� - I 1--1*111?11-11M­1­1-1" w
' " Pb 0.051J Sample GWA-9S Co 1J+
Sample Date 6/30/2015 Cr 3.8
Constituent (NgIL) Hg 1 0.075 J+
Ba 30 Pb r 0.26
Be
Be 0.078 J
Co 50.1
Y Sample MN/-14 - 0.32J+ Sample BG-3S
Sample Date 6/30/2015 Hg 0.11J Sample Date 6/30/2015
' , , ' . •- Constituent (NgIL) Pb 0.14 `I Constituent (NgIL)
,k "�, ' a_ . Ba 7.8 ITI 0.04 J Ba 33
Cr 1.7 J+ Sample GWA-8S ' Cd 0.031 J
,i Mo 0.37 J Sample Date 6/28/2015 - Co 0.54
i ' ,I 'R
e Constituent (NgIL) a Cr 0.25 J+ ,4 w„
t C . ' ; ; r v , '. Ba 130 + ' v1 . � y
.'s Hg 0.073 J
i Mo 0.14 J
�� e .. I � 11 I .. 4 Co 66.8
Sb 1.3 J
_
Cr.+ -,•� � 64J• z'
TI 0.031 J � TA
L` 'y `'.-
}4
K; r i!i d
.g F f „ .! %
3' y �� ik x �. 7; E
P± �! t i � J, r " x" T' V ' rI.Z {: ,��P,J, '';..,5: { '� :i s . . } .. -
i.
i
Y
n
q %••� tr ``PP , „+" �4 1. 4 „r. `•` i ,1i - -'H 1. n • - f
.. s ► 1 .j -ilt _f 4 r
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,� c Y
11
t i' 1 `` ► '
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1
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>I.
•�F �\ ■ a ^t
L' ` • 1i IIMIIIICIIIIIIoIIIIIInIIIIsIIIIIItIIIIiIItIIIIuIIIIeIIIIIInIIIItIII(IIpIIgIII/IILII)II11.. . .Wr fVjZM L il. I . I FF i�*'--' .,-. - vA: , k, , . I 1, - 4: I '- ,' . , I"I`.
4
s
_
F
Analyte
Abbreviation
Antimony
Sb
Arsenic
As
Barium
Ba
Beryllium
Be
Cadmium
Cd
Chromium
Cr
Cobalt
Co
Lead
Pb
Me rcu ry
Hg
Molybdenum
Mo
Selenium
Se
Thallium
TI
Radium-226
Ra-226
Radium-228
Ra-228
A` w w _' �r i t - - - - - - - -
r, ; :_` r
... - a "
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Sa m pie Date 1
6/ 23/ 2015
Constituent (pg/L)
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ASSESSMENT MONITORING CONSTITUENTS DETECTED IN BEDROCK WELLS (BRU AND BR)
DUKE ENER Y AR LINA , LL
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
Analyte
Abbreviation
Antimony
Sb
rsenic
S
Barium
Ba
Beryllium
-
Be
Cadmium
Cd
romium
Cr
_C
Cobalt
co
Lead
Pb
Me rcu ry
Hg
Molybdenum
Mo
Selenium
Se
Thallium
TI
Radium-226
Ra-226
Radium-228
Ra-228
NOTES
U = NOT DETECTED ABOVE THE LABORATORY REPORTING LIMIT
. J = ESTIMATED CONCENTRATION
-
I � <3.0 = LESS THAN THE LABORATORY REPORTING LIMIT
15�j �4
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LEGEND
z�','
Wit.,
I ir
W.
ASH BASIN ASSESSMENT
.
­�,t.L " -
Q�
GROUNDWATER MONITORING WELL
L I I
� ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
I COINCIDENT WITH DUKE ENERGY
PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
I-
ASH STORAGE
-.- I 11 ... � - . k - — - M DUKE ENERGY PROPERTY BOUNDARY
Sample A13-31311
I
Sample Date � 7/23/2015 � I - ''..
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Constituent (p I
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As 1.23 LLL
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Ba 18 )
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co `�­s.
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8.27 L � - .,- 1� `* " I , - � � "
Mo 5.66 44 - *
Se
. _.
-
�,
LLLLL -
'
. �L ' ­�, :
DATE
AUGUST 2015
FIGURE
10-197

NDEH
7RAr,
lkb r1
;TORA
r.
RIVERBEND
EAM STATIC
NOTES:
1. ASH STORAGE BOUNDARY AND CINDER STORAGE BOUNDARY ARE APPROXIMATE.
2. AS -BUILT MONITORING WELL LOCATIONS PROVIDED BY DUKE ENERGY.
3. SHALLOW MONITORING WELLS (S) - WELL SCREEN INSTALLED ACROSS THE SURFICIAL WATER TABLE.
4. DEEP MONITORING WELLS (D) - WELL SCREEN INSTALLED IN THE TRANSITION ZONE BETWEEN COMPETENT BEDROCK AND THE REGOLITH.
S. TOPOGRAPHY DATA FOR THE SITE WAS OBTAINED FROM NCDOT GEOGRAPHIC INFORMATION SYSTEM (GIS) WEB SITE.
6. ORTHOPHOTOGRAPHY WAS OBTAINED FROM WSP (DATED APRIL 2014).
7. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORDING TO THE DEFINITION FOUND IN 15A NCAC 02L .0107 (a).
8. PROPOSED WELL LOCATIONS ARE APPROXIMATE AND MAY BE ADJUSTED DUE TO FIELD CONDITIONS.
9. SEEP SAMPLING LOCATIONS WERE OBTAINED BY HDR USING A TRIMBLE HANDHELD GPS UNIT ON APRIL 29, 2014.
* INDICATES SEEP SAMPLING LOCATIONS WERE NOT RECORDED WITH GPS UNIT AND ARE APPROXIMATE.
ru
ASH B.A
3DIRAAD%
L
SCALE (FEET)
150' 0 /50' 300'
/" = 300'
P
1 r
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LEGEND:
DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY
ASH BASIN COMPLIANCE BOUNDARY COINCIDENT
WITH DUKE ENERGY PROPERTY BOUNDARY
ASH BASIN WASTE BOUNDARY
ASH OR CINDER STORAGE AREA BOUNDARY
—
STREAM
— — — — — — — — — —
TOPOGRAPHIC CONTOUR (4 FOOT)
TRANSECT LINE
EXISTING ASH BASIN VOLUNTARY GROUNDWATER
MONITORING WELL
EXISTING ASH BASIN COMPLIANCE GROUNDWATER
MONITORING WELL
GWAP GROUNDWATER MONITORING WELL LOCATION
OBSERVATION WELL LOCATION
PROPOSED ADDITIONAL GROUNDWATER MONITORING
WELL LOCATION
SEEP SAMPLE LOCATION
SURFACE WATER SAMPLE LOCATION
MAJOR FLOW TRANSECTS
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION
GASTON COUNTY, NORTH CAROLINA
DATE
FIGURE

PRIMARY
PRIMARY
RELEASE
AFFECTED
EXPOSURE
PRIMARY
SOURCE
MECHANISM
MEDIA
ROUTE
RECEPTOR
a�
>Y
Y N
-=
C
O O N
N
i O N
N O Q
N N
U O O H
Incidental Ingestion
X X X X
Surface Soil
Dermal
X X X X
ix
Coal Ash
Infiltration
Inhalation
X X X
Basin
Subsurface Soil
Incidental Ingestion
Dermal
X
X
Particulate Inhalation
X
Incidental Ingestion
Dermal
X
X
solutionNPDES
=Precipitation
Incidental Ingestion
X X X
Discharge
DermalX
X X
Groundwater
Incidental/Potable Ingestion
Dermal
X X
X X
Inhalation
X X
Note:
Exposure pathways are based on the current understanding of the Site and are subject to change.
F)�
HUMAN HEALTH
CONCEPTUAL SITE MODEL
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION
GASTON COUNTY, NORTH CAROLINA
Legend:
ePotentially Complete Exposure Pathway
Incomplete or Insignificant Pathway
DATE
AUGUST 3, 2015
FIGURE
12-1

PRIMARY
PRIMARY
PRIMARY RECEPTOR
RELEASE
AFFECTED
EXPOSURE
EXPOSURE
SOURCE
MECHANISM
MEDIA
MEDIA
ROUTE
Aquatic/Riparian
Terrestrial
N
C
N
N
L
sa) w w
N w w w
0
C Q
N W N
7 7
d
- � W W W
7 7 7
m
60 O O
�p
�u O O O
O
N U
E 7
O O O
> > >
u)
O O O
u) > > .>
7
Cr
-6 7
in
-
U C
a
N
N -2 E
Q
Q
x O
x O U
Coal Ash
Soil
Incidental Ingestion
I
I
I X X
X X X X
Basin
Infiltration
parian
(Upland and Ri)
Soil
Dermal or Root Absorption
Vegetation
Ingestion
XxI
XT]
Terrestrial
Ingestion
X X
Invertebrates
Sma1I Mammals
Ingestion
X X
and Birds
Aquatic/Riparian
Ingestion
Xx
Plants
Benthic and
IngestionF
X
Aquatic Invertebrates
Incidental Ingestion
X X X
Sediment
Dermal or Root Absorption
solution
NPDES
Ingestion or Gill Uptake
X
X X
X
Discharge
WPecipitaStionp�
Surface Water
Dermal or Root Absorption
I Ingestion
X X
Note:
Exposure pathways are based on the current understanding of the Site and are subject to change.
F)�
ECOLOGICAL
CONCEPTUAL SITE MODEL
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION
GASTON COUNTY, NORTH CAROLINA
Legend:
ePotentially Complete Exposure Pathway
Incomplete or Insignificant Pathway
DATE
AUGUST 3, 2015
FIGURE
12-2